☆ 4.6 Article

Time reversal symmetry breakdown in normal and superconducting states in frustrated three-band systems

PHYSICAL REVIEW B (2013)

期刊

PHYSICAL REVIEW B

卷 88, 期 22, 页码 -

出版社

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevB.88.220511

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类别

Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter

资金

Research Council of Norway [205591/V20, 216700/F20]
Knut and Alice Wallenberg Foundation through the Royal Swedish Academy of Sciences Fellowship
Swedish Research Council
National Science Foundation [DMR-0955902]
NSF [1066293]
NTNU
Direct For Mathematical & Physical Scien
Division Of Materials Research [0955902] Funding Source: National Science Foundation

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Reagent

摘要

We discuss the phase diagram and phase transitions in U(1) x Z(2) three-band superconductors with broken time reversal symmetry. We find that beyond mean-field approximation and for sufficiently strong frustration of interband interactions there appears an unusual metallic state precursory to a superconducting phase transition. In that state, the system is not superconducting. Nonetheless, it features a spontaneously broken Z(2) time reversal symmetry. By contrast, for weak frustration of interband coupling the energy of a domain wall between different Z(2) states is low and thus fluctuations restore broken time reversal symmetry in the superconducting state at low temperatures.

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