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Possible 3D nematic odd-parity pairing in Sr$_2$RuO$_4$: experimental evidences and predictions | | Wen Huang
; Yi Zhou
; Hong Yao
; | | Date: |
21 Jan 2019 | | Abstract: | It was recently proposed that, due to a nontrivial three-dimensional
spin-orbital entanglement, Sr$_2$RuO$_4$ may be a time-reversal invariant
nematic $p$-wave superconductor with coexisting in-plane and out-of-plane
pairings. Here we discuss various signatures of such a state if the
out-of-plane pairing component is dominant. First, the enhancement of the
superconducting $T_c$ under in-plane uniaxial strains is nearly a quadratic
function of the strain, because the out-of-plane pairing lacks a linear-order
coupling to the strain. Second, when the strain applies along a certain
in-plane direction, the nematic $p$-wave pairing exhibits only a single phase
transition as the temperature is lowered. These are consistent with several
recent uniaxial strain measurements, which are otherwise hard to reconcile with
chiral $p$-wave order. We further show that the nematic $p$-wave state can be
distinguished from the chiral $p$-wave state through the velocity jumps of
certain sound waves at the onset of superconductivity. | | Source: | arXiv, 1901.7041 | | Services: | Forum | Review | PDF | Favorites | |
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