Superconducting properties and materials articles within Nature

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• Matters Arising | 25 August 2021

  Unusual width of the superconducting transition in a hydride

  • J. E. Hirsch
  •  & F. Marsiglio

• Article | 04 August 2021

  Pseudogap in a crystalline insulator doped by disordered metals

  A back-bending band structure and an emerging pseudogap are observed at the interface between a crystalline solid (black phosphorus) and disordered alkali-metal dopants.

  • Sae Hee Ryu
  • , Minjae Huh
  •  & Keun Su Kim

• Article | 28 July 2021

  Incoherent transport across the strange-metal regime of overdoped cuprates

  Measurements of high-field magnetotransport in overdoped cuprates indicate that the strange-metal regime exists beyond the critical doping, and that it has both coherent and incoherent contributions.

  • J. Ayres
  • , M. Berben
  •  & N. E. Hussey

• Article | 21 July 2021

  Pauli-limit violation and re-entrant superconductivity in moiré graphene

  A large violation of the Pauli limit and re-entrant superconductivity in a magnetic field is reported for magic-angle twisted trilayer graphene, suggesting that the spin configuration of the superconducting state of this material is unlikely to consist of spin singlets.

  • Yuan Cao
  • , Jeong Min Park
  •  & Pablo Jarillo-Herrero

• Article | 07 July 2021

  Optical manipulation of electronic dimensionality in a quantum material

  Two-dimensional electronic states are observed at the induced domain walls of a three-dimensional charge density wave material by manipulating the periodic lattice distortion via femtosecond infrared pulses.

  • Shaofeng Duan
  • , Yun Cheng
  •  & Wentao Zhang

• Article | 01 February 2021

  Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene

  Highly tunable moiré superconductivity is observed in magic-angle twisted trilayer graphene, and observations suggest that this superconductor can be tuned close to the crossover to a two-dimensional Bose–Einstein condensate.

  • Jeong Min Park
  • , Yuan Cao
  •  & Pablo Jarillo-Herrero

• Article | 14 October 2020

  RETRACTED ARTICLE: Room-temperature superconductivity in a carbonaceous sulfur hydride

  Room-temperature superconductivity is observed in a photochemically synthesized ternary carbonaceous sulfur hydride system at 15 °C and 267 GPa.

  • Elliot Snider
  • , Nathan Dasenbrock-Gammon
  •  & Ranga P. Dias

• Article | 26 August 2020

  Impact of ionizing radiation on superconducting qubit coherence

  Ionizing radiation from environmental radioactivity and cosmic rays increases the density of broken Cooper pairs in superconducting qubits, reducing their coherence times, but can be partially mitigated by lead shielding.

  • Antti P. Vepsäläinen
  • , Amir H. Karamlou
  •  & William D. Oliver

• Article | 19 August 2020

  Observation of superconducting diode effect

  A superconducting diode that has zero resistance in only one direction is realized in an artificially engineered superlattice without inversion symmetry, enabling directional charge transport without energy loss.

  • Fuyuki Ando
  • , Yuta Miyasaka
  •  & Teruo Ono

• Article | 15 July 2020

  Superconductivity in metallic twisted bilayer graphene stabilized by WSe₂

  Placing a single layer of tungsten diselenide in contact with twisted bilayer graphene enables superconductivity even for non-magic twist angles where insulating behavior is absent.

  • Harpreet Singh Arora
  • , Robert Polski
  •  & Stevan Nadj-Perge

• Article | 08 July 2020

  Tunable spin-polarized correlated states in twisted double bilayer graphene

  Twisted double bilayer graphene devices show tunable spin-polarized correlated states that are sensitive to electric and magnetic fields, providing further insights into correlated states in two-dimensional moiré materials.

  • Xiaomeng Liu
  • , Zeyu Hao
  •  & Philip Kim

• Article | 06 July 2020

  Untying the insulating and superconducting orders in magic-angle graphene

  Tuning the electronic interactions by changing the dielectric environment of twisted bilayer graphene reveals the disappearance of the insulating states and their replacement by superconducting phases, suggesting a competition between the two phases.

  • Petr Stepanov
  • , Ipsita Das
  •  & Dmitri K. Efetov

• Article | 01 April 2020

  Imaging the energy gap modulations of the cuprate pair-density-wave state

  Using a spectroscopic technique based on scanning tunnelling microscopy, the superconducting energy gap modulations in a copper oxide are visualized, demonstrating that a pair-density-wave state coexists with superconductivity.

  • Zengyi Du
  • , Hui Li
  •  & Kazuhiro Fujita

• Article | 25 March 2020

  Chiral superconductivity in heavy-fermion metal UTe₂

  Scanning tunnelling microscopy and spectroscopy measurements show chiral edge states inside the superconducting gap of the heavy-fermion superconductor UTe₂, indicating the presence of chiral spin-triplet superconductivity.

  • Lin Jiao
  • , Sean Howard
  •  & Vidya Madhavan

• Article | 05 February 2020

  Quantum crystal structure in the 250-kelvin superconducting lanthanum hydride

  Quantum atomic fluctuations have a crucial role in stabilizing the crystal structure of the high-pressure superconducting phase of lanthanum hydride.

  • Ion Errea
  • , Francesco Belli
  •  & José A. Flores-Livas

• Article | 30 October 2019

  Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene

  The fabrication of magic-angle twisted bilayer graphene devices with highly uniform twist angles enables the observation of new superconducting domes, orbital magnets and Chern insulating states.

  • Xiaobo Lu
  • , Petr Stepanov
  •  & Dmitri K. Efetov

• Article | 30 October 2019

  High-temperature superconductivity in monolayer Bi₂Sr₂CaCu₂O_8+δ

  Transport and scanning tunnelling microscopy studies of freestanding monolayers of an unconventional layered copper oxide establish that the superconducting properties of copper oxides are not changed in the 2D limit.

  • Yijun Yu
  • , Liguo Ma
  •  & Yuanbo Zhang

• Letter | 23 September 2019

  Constraints on the superconducting order parameter in Sr₂RuO₄ from oxygen-17 nuclear magnetic resonance

  ¹⁷O nuclear magnetic resonance measurements on Sr₂RuO₄ reveal a drop of the Knight shift in the superconducting state, contradicting previous work and imposing tight constraints on the order parameter symmetry of the system.

  • A. Pustogow
  • , Yongkang Luo
  •  & S. E. Brown

• Letter | 28 August 2019

  Superconductivity in an infinite-layer nickelate

  Superconductivity is demonstrated in an infinite-layer nickelate similar to infinite-layer copper oxides, which is synthesized using soft- chemistry topotactic reduction of the perovskite precursor phase.

  • Danfeng Li
  • , Kyuho Lee
  •  & Harold Y. Hwang

• Letter | 21 August 2019

  Electron pairing in the pseudogap state revealed by shot noise in copper oxide junctions

  Shot-noise measurements in copper oxides reveal paired charge carriers existing in the pseudogap above the superconducting critical temperature, shedding light on the properties of high-temperature superconductivity in these materials.

  • Panpan Zhou
  • , Liyang Chen
  •  & Douglas Natelson

• Letter | 31 July 2019

  Maximized electron interactions at the magic angle in twisted bilayer graphene

  Scanning tunnelling spectroscopy is used to map the atomic-scale electronic structure of magic-angle twisted bilayer graphene, finding multiple signatures of electron correlations and thus providing insight into the sought-after mechanism behind superconductivity in graphene.

  • Alexander Kerelsky
  • , Leo J. McGilly
  •  & Abhay N. Pasupathy

• Letter | 31 July 2019

  Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene

  Scanning tunnelling spectroscopy and extended-Hubbard-model cluster calculations reveal that magic-angle twisted bilayer graphene is a strongly correlated electron system, similar to other unconventional superconductors.

  • Yonglong Xie
  • , Biao Lian
  •  & Ali Yazdani

• Letter | 24 July 2019

  A strongly inhomogeneous superfluid in an iron-based superconductor

  Atomic-resolution imaging of a strongly inhomogeneous superfluid in an iron-based superconductor shows spatial correlation between superfluid density variations and the strength of quasiparticle character.

  • D. Cho
  • , K. M. Bastiaans
  •  & M. P. Allan

• Letter | 17 July 2019

  Signatures of tunable superconductivity in a trilayer graphene moiré superlattice

  By varying the vertical displacement field in a trilayer graphene and hexagonal boron nitride moiré superlattice, transitions can be observed from the superconducting phase to Mott insulator and metallic phases.

  • Guorui Chen
  • , Aaron L. Sharpe
  •  & Feng Wang

• Letter | 17 July 2019

  Giant thermal Hall conductivity in the pseudogap phase of cuprate superconductors

  The so-called pseudogap phase in hole-doped cuprate superconductors is associated with an unusually large thermal Hall effect that attains unprecedented levels as the parent Mott insulator is approached.

  • G. Grissonnanche
  • , A. Legros
  •  & L. Taillefer

• Letter | 19 June 2019

  Perfect Andreev reflection due to the Klein paradox in a topological superconducting state

  Perfect transmission of electrons through a finite potential barrier between a normal metal and a topological superconducting state is demonstrated, as evidenced by an exact doubling of conductance in point contact measurements.

  • Seunghun Lee
  • , Valentin Stanev
  •  & Ichiro Takeuchi

• Letter | 22 May 2019

  Superconductivity at 250 K in lanthanum hydride under high pressures

  A lanthanum hydride compound at a pressure of around 170 gigapascals is found to exhibit superconductivity with a critical temperature of 250 kelvin.

  • A. P. Drozdov
  • , P. P. Kong
  •  & M. I. Eremets

• Letter | 24 April 2019

  Evidence of topological superconductivity in planar Josephson junctions

  Evidence is found for phase-tunable Majorana zero modes in scalable two-dimensional Josephson junctions produced by top-down fabrication.

  • Antonio Fornieri
  • , Alexander M. Whiticar
  •  & Fabrizio Nichele

• Letter | 13 February 2019

  Thermodynamic signatures of quantum criticality in cuprate superconductors

  Measurements of the specific heat of two cuprate materials at low temperature in magnetic fields large enough to suppress superconductivity and over a wide doping range reveal that the pseudogap phase of cuprates ends at a quantum critical point.

  • B. Michon
  • , C. Girod
  •  & T. Klein

• Letter | 31 October 2018

  Three-dimensional collective charge excitations in electron-doped copper oxide superconductors

  Resonant inelastic X-ray scattering on electron-doped copper oxide superconductors reveals a three-dimensional charge collective mode, which has properties suggestive of the long-sought acoustic plasmon.

  • M. Hepting
  • , L. Chaix
  •  & W. S. Lee

• Letter | 28 March 2018

  RETRACTED ARTICLE: Quantized Majorana conductance

  In a step towards topological quantum computation, a quantized Majorana conductance has been demonstrated for a semiconducting nanowire coupled to a superconductor.

  • Hao Zhang
  • , Chun-Xiao Liu
  •  & Leo P. Kouwenhoven

• Article | 08 March 2018

  GaN/NbN epitaxial semiconductor/superconductor heterostructures

  Group III/nitride semiconductors have been grown epitaxially on the superconductor niobium nitride, allowing the superconductor’s macroscopic quantum effects to be combined with the semiconductors’ electronic, photonic and piezoelectric properties.

  • Rusen Yan
  • , Guru Khalsa
  •  & Debdeep Jena

• Article | 05 March 2018

  Unconventional superconductivity in magic-angle graphene superlattices

  A superlattice consisting of two graphene sheets twisted relative to each other by a specific amount exhibits superconductivity when doped electrostatically, with a relatively high critical temperature.

  • Yuan Cao
  • , Valla Fatemi
  •  & Pablo Jarillo-Herrero

• Letter | 14 September 2017

  Hardware-efficient variational quantum eigensolver for small molecules and quantum magnets

  The ground-state energy of small molecules is determined efficiently using six qubits of a superconducting quantum processor.

  • Abhinav Kandala
  • , Antonio Mezzacapo
  •  & Jay M. Gambetta

• Letter | 07 August 2017

  Electronic in-plane symmetry breaking at field-tuned quantum criticality in CeRhIn₅

  Electronic nematicity is observed in a heavy-fermion superconductor, CeRhIn₅, suggesting a close link between unconventional superconductivity and the appearance of nematicity.

  • F. Ronning
  • , T. Helm
  •  & P. J. W. Moll

• Letter | 27 July 2017

  Spontaneous breaking of rotational symmetry in copper oxide superconductors

  The electronic nematic phase in copper oxide superconductors is found over a broad range of temperature and doping but is not aligned with the crystal axes.

  • J. Wu
  • , A. T. Bollinger
  •  & I. Božović

• Letter | 17 August 2016

  Dependence of the critical temperature in overdoped copper oxides on superfluid density

  The scaling law for the critical temperature and zero-temperature stiffness in an overdoped copper oxide semiconductor does not conform to the standard Bardeen–Cooper–Schrieffer description.

  • I. Božović
  • , X. He
  •  & A. T. Bollinger

• Letter | 20 July 2016

  Electron attraction mediated by Coulomb repulsion

  Experimental demonstration of excitonic attraction between two electrons is achieved in quantum devices made from carbon nanotubes, where the interaction between two electrons is reversed from repulsive to attractive owing to their strong Coulomb interaction with another electronic system.

  • A. Hamo
  • , A. Benyamini
  •  & S. Ilani

• Letter | 13 April 2016

  Detection of a Cooper-pair density wave in Bi₂Sr₂CaCu₂O_8+x

  Scanned Josephson tunnelling microscopy is used to image Cooper pair tunnelling from a superconducting microscope tip to the quantum condensate of Bi₂Sr₂CaCu₂O_8+x, thus revealing the spatially modulated density of Cooper pairs predicted from several theories of the cuprate pseudogap phase.

  • M. H. Hamidian
  • , S. D. Edkins
  •  & J. C. Séamus Davis

• Letter | 28 March 2016

  Quantum hydrogen-bond symmetrization in the superconducting hydrogen sulfide system

  Ab initio calculations are used to determine the contribution of quantum fluctuations to the crystal structure of the high-pressure superconducting phase of H₃S and D₃S; the quantum nature of the proton is found to fundamentally change the superconducting phase diagram of H₃S.

  • Ion Errea
  • , Matteo Calandra
  •  & Francesco Mauri

• Letter | 22 February 2016

  Change of carrier density at the pseudogap critical point of a cuprate superconductor

  Low-temperature measurements of the Hall effect in cuprate materials in which superconductivity is suppressed by high magnetic fields show that the pseudogap is not related to the charge ordering that has been seen at intermediate doping levels, but is instead linked to the antiferromagnetic Mott insulator at low doping.

  • S. Badoux
  • , W. Tabis
  •  & Cyril Proust

• Letter | 08 February 2016

  Possible light-induced superconductivity in K₃C₆₀ at high temperature

  By exciting high-temperature K₃C₆₀ with mid-infrared pulses, a large increase in carrier mobility is obtained, accompanied by the opening of a gap in the optical conductivity; these same signatures are observed at equilibrium when cooling K₃C₆₀ below the superconducting transition temperature of 20 kelvin, which could be an indication of light-induced high-temperature superconductivity.

  • M. Mitrano
  • , A. Cantaluppi
  •  & A. Cavalleri

• Letter | 23 December 2015

  Controlling many-body states by the electric-field effect in a two-dimensional material

  To be able to control the properties of a system that has strong electron–electron interactions using only an external electric field would be ideal, but the material must be thin enough to avoid shielding of the electric field in the bulk material; here pure electric-field control of the charge-density wave and superconductivity transition temperatures is achieved by electrolyte gating through an electric-field double layer transistor in the two-dimensional material 1T-TiSe₂.

  • L. J. Li
  • , E. C. T. O’Farrell
  •  & A. H. Castro Neto

• Letter | 16 September 2015

  Inhomogeneity of charge-density-wave order and quenched disorder in a high-T_c superconductor

  Micro X-ray diffraction imaging of the spatial distribution of charge-density-wave puddles and quenched disorder in HgBa₂CuO_{4 + y} reveals a complex, inhomogeneous spatial landscape due to the interplay between charge and dopant order.

  • G. Campi
  • , A. Bianconi
  •  & A. Ricci

• Letter | 17 August 2015

  Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system

  Conventional superconductivity is observed at 203 kelvin in the sulfur hydride system, well above the highest superconducting transition temperature obtained in the copper oxides, raising hopes that even higher transition temperatures will be discovered in other hydrogen-rich systems.

  • A. P. Drozdov
  • , M. I. Eremets
  •  & S. I. Shylin

• Letter | 14 May 2015

  Electron pairing without superconductivity

  Evidence is presented for electron pairing in strontium titanate far above the superconducting transition temperature; such pairs are thought to be the long-sought pre-formed pairs that condense at lower temperatures to give rise to the unconventional superconducting state in this system.

  • Guanglei Cheng
  • , Michelle Tomczyk
  •  & Jeremy Levy

• Review Article | 11 February 2015

  From quantum matter to high-temperature superconductivity in copper oxides

  A review of the phases of copper oxides (especially the ‘strange metal’), discussing their high-temperature superconductivity and their various forms of quantum matter, and the implications for fundamental theory.

  • B. Keimer
  • , S. A. Kivelson
  •  & J. Zaanen

• Letter | 03 December 2014

  Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa₂Cu₃O_6.5

  Femtosecond X-ray diffraction and ab initio density functional theory calculations are used to determine the crystal structure of YBa₂Cu₃O_6.5 undergoing optically driven, nonlinear lattice excitation above the transition temperature of 52 kelvin, under which conditions the electronic structure of the material changes in such a way as to favour superconductivity.

  • R. Mankowsky
  • , A. Subedi
  •  & A. Cavalleri

• Letter | 12 November 2014

  Interfacial mode coupling as the origin of the enhancement of T_c in FeSe films on SrTiO₃

  High-resolution angle-resolved photoemission spectroscopy reveals bosonic modes in a SrTiO₃ substrate coupling to electrons in an FeSe overlayer to facilitate high-temperature superconductivity.

  • J. J. Lee
  • , F. T. Schmitt
  •  & Z.-X. Shen

• Letter | 15 June 2014

  Normal-state nodal electronic structure in underdoped high-T_c copper oxides

  Quantum oscillation measurements in the underdoped copper oxide YBa₂Cu₃O_6 + x reveal a nodal electronic structure from charge order, which helps to characterize the normal state out of which superconductivity emerges in the underdoped regime.

  • Suchitra E. Sebastian
  • , N. Harrison
  •  & G. G. Lonzarich