Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites

N. Mannella (), W. L. Yang, X. J. Zhou, H. Zheng, J. F. Mitchell, J. Zaanen, T. P. Devereaux, N. Nagaosa, Z. Hussain and Z.-X. Shen ()
Additional contact information
N. Mannella: Stanford University
W. L. Yang: Stanford University
X. J. Zhou: Stanford University
H. Zheng: Argonne National Laboratory
J. F. Mitchell: Argonne National Laboratory
J. Zaanen: Stanford University
T. P. Devereaux: University of Waterloo
N. Nagaosa: The University of Tokyo
Z. Hussain: Advanced Light Source, Lawrence Berkeley National Laboratory
Z.-X. Shen: Stanford University

Nature, 2005, vol. 438, issue 7067, 474-478

Abstract: Mind the pseudogap A surprise finding has united the physics of two of the most important classes of materials in condensed-matter physics, but it seems to raise more questions than it answers. High-temperature copper oxide superconductors display what was thought to be a characteristic feature, a difference between electronic excitations in directions parallel and diagonal to the bonds between copper and oxygen atoms. This gap structure or ‘pseudogap’ state seemed to be unique to these compounds, so it was natural to assume it had something to do with superconductivity. But now a similar state has been identified in a ferromagnetic bilayer manganite, a ‘colossal magnetoresistive material’ that is very different from a superconductor. The ‘enigmatic’ pseudogap structure has become a bit more enigmatic, and as a result researchers are likely to reconsider the nature of the link to superconductivity.

Date: 2005
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DOI: 10.1038/nature04273

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