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Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites

Nature volume 438, pages 474–478 (2005)Cite this article

Abstract

A characteristic feature of the copper oxide high-temperature superconductors is the dichotomy between the electronic excitations along the nodal (diagonal) and antinodal (parallel to the Cu–O bonds) directions in momentum space, generally assumed to be linked to the ‘d-wave’ symmetry of the superconducting state. Angle-resolved photoemission measurements in the superconducting state have revealed a quasiparticle spectrum with a d-wave gap structure that exhibits a maximum along the antinodal direction and vanishes along the nodal direction1. Subsequent measurements have shown that, at low doping levels, this gap structure persists even in the high-temperature metallic state, although the nodal points of the superconducting state spread out in finite ‘Fermi arcs’2. This is the so-called pseudogap phase, and it has been assumed that it is closely linked to the superconducting state, either by assigning it to fluctuating superconductivity3 or by invoking orders which are natural competitors of d-wave superconductors4,5. Here we report experimental evidence that a very similar pseudogap state with a nodal–antinodal dichotomous character exists in a system that is markedly different from a superconductor: the ferromagnetic metallic groundstate of the colossal magnetoresistive bilayer manganite La1.2Sr1.8Mn2O7. Our findings therefore cast doubt on the assumption that the pseudogap state in the copper oxides and the nodal-antinodal dichotomy are hallmarks of the superconductivity state.

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Figure 1: Data collected along the (0,0)–(π,π) nodal direction at various magnifications.
Figure 2: Dispersion of the e gband.
Figure 4: Nodal–antinodal dichotomy in momentum space.
Figure 3: Fermi surface topology.
Figure 5: Temperature-dependent evolution of the nodal quasiparticle.

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Acknowledgements

The work at the ALS and SSRL is supported by the DOE Office of Basic Energy Science, Division of Material Science. The work at Stanford is also supported by an NSF grant and an ONR grant. The work at Argonne National Laboratory is supported by the US Department of Energy Office of Science.

Author information

Authors and Affiliations

  1. Departments of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, California, 94305, Stanford, USA

    N. Mannella, W. L. Yang, X. J. Zhou, J. Zaanen & Z.-X. Shen

  2. Advanced Light Source, Lawrence Berkeley National Laboratory, California, 94720, Berkeley, USA

    N. Mannella, W. L. Yang, X. J. Zhou & Z. Hussain

  3. Materials Science Division, Argonne National Laboratory, Illinois, 60439, Argonne, USA

    H. Zheng & J. F. Mitchell

  4. Instituut Lorentz for Theoretical Physics, Leiden University, POB 9506, 2300, RA Leiden, The Netherlands

    J. Zaanen

  5. Department of Physics, University of Waterloo, Waterloo, N2L 3G1, Ontario, Canada

    T. P. Devereaux

  6. CREST, Department of Applied Physics, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-8656, Tokyo, Japan

    N. Nagaosa

  7. Correlated Electron Research Center, AIST, 305-8562, Tsukuba, Japan

    N. Nagaosa

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Correspondence to N. Mannella or Z.-X. Shen.

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Mannella, N., Yang, W., Zhou, X. et al. Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites. Nature 438, 474–478 (2005). https://doi.org/10.1038/nature04273

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