Nematic and chiral superconductivity induced by odd-parity fluctuations

Fengcheng Wu; Ivar Martin

doi:10.1103/PhysRevB.96.144504

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Nematic and chiral superconductivity induced by odd-parity fluctuations

Fengcheng Wu, Ivar Martin

DOI 10.1103/PhysRevB.96.144504 · Physical Review B

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Abstract

Recent experiments indicate that superconductivity in Bi2Se3 intercalated with Cu, Nb, or Sr is nematic with rotational symmetry breaking. Motivated by this observation, we present a model study of nematic and chiral superconductivity induced by odd-parity fluctuations. We show that odd-parity fluctuations in the two-component Eu representation of D3d crystal point group can generate attractive interaction in both the even-parity s-wave and odd-parity Eu pairing channels, but repulsive interaction in other odd-parity pairing channels. Coulomb repulsion can suppress s-wave pairing relative to Eu pairing, and thus the latter can have a higher critical temperature. Eu pairing has two distinct phases: a nematic phase and a chiral phase, both of which can be realized in our model. When s-wave and Eu pairings have similar instability temperature, we find an intermediate phase in which both types of pairing coexist.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown