Massless Leggett Mode in Three-Band Superconductors with Time-Reversal-Symmetry Breaking

Shi-Zeng Lin; Xiao Hu

doi:10.1103/PhysRevLett.108.177005

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Massless Leggett Mode in Three-Band Superconductors with Time-Reversal-Symmetry Breaking

Shi-Zeng Lin, Xiao Hu

DOI 10.1103/PhysRevLett.108.177005 · Physical Review Letters

T1

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Abstract

The Leggett mode associated with out-of-phase oscillations of the superconducting phase in multiband superconductors usually is heavy due to interband coupling, which makes its excitation and detection difficult. We report on the existence of a massless Leggett mode in three-band superconductors with time-reversal-symmetry breaking. The mass of this Leggett mode is small close to the time-reversal-symmetry-breaking transition and vanishes at the transition point, and thus locates within the smallest superconducting energy gap, which makes it stable and detectable, e.g., by means of the Raman spectroscopy. The thermodynamic consequences of this massless mode and possible realization in iron-based superconductors are also discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown