Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states

M. J. Lawler, K. Fujita, Jhinhwan Lee, A. R. Schmidt, Y. Kohsaka, Chung Koo Kim, H. Eisaki, S. Uchida, J. C. Davis, J. P. Sethna and Eun-Ah Kim ()
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M. J. Lawler: Applied Physics and Astronomy, Binghamton University
K. Fujita: Laboratory for Atomic and Solid State Physics, Cornell University
Jhinhwan Lee: Laboratory for Atomic and Solid State Physics, Cornell University
A. R. Schmidt: Laboratory for Atomic and Solid State Physics, Cornell University
Y. Kohsaka: Magnetic Materials Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
Chung Koo Kim: Laboratory for Atomic and Solid State Physics, Cornell University
H. Eisaki: Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
S. Uchida: University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
J. C. Davis: Laboratory for Atomic and Solid State Physics, Cornell University
J. P. Sethna: Laboratory for Atomic and Solid State Physics, Cornell University
Eun-Ah Kim: Laboratory for Atomic and Solid State Physics, Cornell University

Nature, 2010, vol. 466, issue 7304, 347-351

Abstract: Order in the pseudogap Within the pseudogap phase of the high-Tc superconductors, it has been unclear which electronic symmetries (if any) are broken, what the identity of any associated order parameter might be, and which microscopic electronic degrees of freedom are active. Lawler et al. report the determination of a quantitative order parameter representing intra-unit cell nematicity — the breaking of rotational symmetry by the electronic structure within each CuO2 unit cell. They find electronic differences at the two oxygen sites within each unit cell. If the excitations seen by different techniques in the pseudogap phase all have the same origin, they would represent weakly magnetic states at the O sites, the electronic structure of which breaks a 90° rotational symmetry.

Date: 2010
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DOI: 10.1038/nature09169

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