期刊
SCIENCE
卷 356, 期 6335, 页码 295-297出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aad1188
关键词
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资金
- U.S. Department of Energy [DE-SC0010533]
- U. S. Army Research Office Defense University Research Instrumentation Program [W911NF-13-1-0293]
- Alfred P. Sloan Foundation [FG-BR2014-027]
- Institute for Quantum Information and Matter
- NSF Physics Frontiers Center [PHY-1125565]
- Gordon and Betty Moore Foundation [GBMF1250]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- NSF Materials Research Science and Engineering Center [DMR-1420451]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125565] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0010533] Funding Source: U.S. Department of Energy (DOE)
Strong electron interactions can drive metallic systems toward a variety of well-known symmetry-broken phases, but the instabilities of correlated metals with strong spin-orbit coupling have only recently begun to be explored. We uncovered a multipolar nematic phase of matter in the metallic pyrochlore Cd2Re2O7 using spatially resolved secondharmonic optical anisotropy measurements. Like previously discovered electronic nematic phases, this multipolar phase spontaneously breaks rotational symmetry while preserving translational invariance. However, it has the distinguishing property of being odd under spatial inversion, which is allowed only in the presence of spin-orbit coupling. By examining the critical behavior of the multipolar nematic order parameter, we show that it drives the thermal phase transition near 200 kelvin in Cd2Re2O7 and induces a parity-breaking lattice distortion as a secondary order.
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