Abstract
The pseudogap region of the phase diagram is an important unsolved puzzle in the field of high-transition-temperature (high-Tc) superconductivity, characterized by anomalous physical properties1,2. There are open questions about the number of distinct phases and the possible presence of a quantum-critical point underneath the superconducting dome3,4,5. The picture has remained unclear because there has not been conclusive evidence for a new type of order. Neutron scattering measurements for YBa2Cu3O6+δ (YBCO) resulted in contradictory claims of no6,7 and weak8,9 magnetic order, and the interpretation of muon spin relaxation measurements on YBCO10,11 and of circularly polarized photoemission experiments on Bi2Sr2CaCu2O8+δ(refs 12, 13) has been controversial. Here we use polarized neutron diffraction to demonstrate for the model superconductor HgBa2CuO4+δ (Hg1201) that the characteristic temperature T* marks the onset of an unusual magnetic order. Together with recent results for YBCO14,15, this observation constitutes a demonstration of the universal existence of such a state. The findings appear to rule out theories that regard T* as a crossover temperature16,17,18 rather than a phase transition temperature19,20,21. Instead, they are consistent with a variant of previously proposed charge-current-loop order19,20 that involves apical oxygen orbitals22, and with the notion that many of the unusual properties arise from the presence of a quantum-critical point3,4,5,19.
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References
Timusk, T. & Statt, B. The pseudogap in high-temperature superconductors: an experimental survey. Rep. Prog. Phys. 62, 61–122 (1999)
Norman, M. R., Pines, D. & Kallin, C. The pseudogap: friend or foe of high T c? Adv. Phys. 54, 715–733 (2005)
Laughlin, R. B. A critique of two metals. Adv. Phys. 47, 943–958 (1998)
Sachdev, S. Quantum criticality: competing ground states in low dimensions. Science 288, 475–480 (2000)
Tallon, J. L. & Loram, J. W. The doping dependence of T*: what is the real high-T c phase diagram? Physica C 349, 53–68 (2001)
Lee, S.-H. et al. Search for orbital moments in underdoped cuprate metals. Phys. Rev. B 60, 10405–10417 (1999)
Stock, C. et al. Neutron scattering search for static magnetism in oxygen-ordered YBa2Cu3O6.5 . Phys. Rev. B 66, 024505 (2002)
Sidis, Y. et al. Antiferromagnetic ordering in superconducting YBa2Cu3O6. 5 . Phys. Rev. Lett. 86, 4100–4103 (2001)
Mook, H. A. et al. Polarized neutron measurement of magnetic order in YBa2Cu3O6. 45 . Phys. Rev. B 69, 134509 (2004)
Sonier, J. E. et al. Anomalous weak magnetism in superconducting YBa2Cu3O6+x . Science 292, 1692–1695 (2001)
Sonier, J. E. et al. Correlations between charge ordering and local magnetic fields in overdoped YBa2Cu3O6+x . Phys. Rev. B 66, 134501 (2002)
Kaminski, A. et al. Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-T c superconductor. Nature 416, 610–613 (2002)
Borisenko, S. V. et al. Circular dichroism in angle-resolved photoemission spectra of under- and overdoped Pb-Bi2212. Phys. Rev. Lett. 92, 207001 (2004)
Fauqué, B. et al. Magnetic order in the pseudogap phase of high-T c superconductors. Phys. Rev. Lett. 96, 197001 (2006)
Mook, H. A. et al. Observation of magnetic order in a YBa2Cu3O6.6 superconductor. Phys. Rev. B 78, 020506 (2008)
Emery, V. J. & Kivelson, S. A. Importance of phase fluctuations in superconductors with small superfluid density. Nature 374, 434–437 (1995)
Lee, P. A. Pseudogaps in underdoped cuprates. Physica C 317, 194–204 (1999)
Anderson, P. W. et al. The physics behind high-temperature superconducting cuprates: the ‘plain vanilla’ version of RVB. J. Phys. Cond. Mater. 16, R755–R769 (2004)
Varma, C. M. Non-Fermi-liquid states and pairing instability of a general model of copper oxide metals. Phys. Rev. B 55, 14554–14580 (1997)
Varma, C. M. Theory of the pseudogap state of the cuprates. Phys. Rev. B 73, 155113 (2006)
Chakravarty, S., Laughlin, R. B., Morr, D. K. & Nayak, C. Hidden order in the cuprates. Phys. Rev. B 63, 094503 (2001)
Weber, C., Läuchli, A., Mila, F. & Giamarchi, T. Orbital currents in extended Hubbard models of high-T c cuprates. Preprint available at 〈http://arxiv.org/abs/0803.3983〉.
Putilin, S. N., Antipov, E. V., Chmaissem, O. & Marezio, M. Superconductivity at 94 K in HgBa2CuO4+δ . Nature 362, 226–228 (1993)
Eisaki, H. et al. Effect of chemical inhomogeneity in bismuth-based copper oxide superconductors. Phys. Rev. B 69, 064512 (2004)
Bobroff, J. et al. 17O NMR evidence for a pseudogap in the monolayer HgBa2CuO4+δ . Phys. Rev. Lett. 78, 3757–3760 (1997)
Zhao, X. et al. Crystal growth and characterization of the model high-temperature superconductor HgBa2CuO4+δ . Adv. Mater. 18, 3243–3247 (2006)
Liang, R., Bonn, D. A. & Hardy, W. N. Evaluation of CuO2 plane hole doping in YBa2Cu3O6+x single crystals. Phys. Rev. B 73, 180505 (2006)
Yamamoto, A. et al. Thermoelectric power and resistivity of HgBa2CuO4+δ over a wide doping range. Phys. Rev. B 63, 024504 (2001)
Xia, J. et al. Polar Kerr-effect measurement of the high-temperature YBa2Cu3O6+x superconductor: evidence for broken symmetry near the pseudogap temperature. Phys. Rev. Lett. 100, 127002 (2008)
Aji, V. & Varma, C. M. Spin order accompanying loop-current order in cuprate superconductors. Phys. Rev. B 75, 224511 (2007)
Acknowledgements
We thank H. Alloul and C. Varma for comments. The work at Stanford University was supported by grants from the US Department of Energy and the National Science Foundation.
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Li, Y., Balédent, V., Barišić, N. et al. Unusual magnetic order in the pseudogap region of the superconductor HgBa2CuO4+δ. Nature 455, 372–375 (2008). https://doi.org/10.1038/nature07251
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DOI: https://doi.org/10.1038/nature07251
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