Effects of deep superconducting gap minima and disorder on residual thermal transport in $\mathrm{Sr_2 Ru O_4}
Phys. Rev. B 98, 214520 (2018) Recent thermal conductivity measurements on $\mathrm{Sr_2 Ru O_4}$ [E. Hassinger et al., Phys. Rev. X 7, 011032 (2017)] were interpreted as favoring a pairing gap function with vertical line nodes while conflicting with chiral $p$-wave pairing. Motivated by this work w...
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Main Authors | , , |
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Format | Journal Article |
Language | English |
Published |
01.10.2018
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Subjects | |
Online Access | Get full text |
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Summary: | Phys. Rev. B 98, 214520 (2018) Recent thermal conductivity measurements on $\mathrm{Sr_2 Ru O_4}$ [E.
Hassinger et al., Phys. Rev. X 7, 011032 (2017)] were interpreted as favoring a
pairing gap function with vertical line nodes while conflicting with chiral
$p$-wave pairing. Motivated by this work we study the effects of deep
superconducting gap minima on impurity induced quasiparticle thermal transport
in chiral $p$-wave models of $\mathrm{Sr_2 Ru O_4}$. Combining a
self-consistent T-matrix analysis and self-consistent Bogoliubov-de-Gennes
calculations, we show that the dependence of the residual thermal conductivity
on the normal state impurity scattering rate can be quite similar to the
$d$-wave pairing state that was shown to fit the thermal conductivity
measurements, provided the normal state impurity scattering rate is large
compared with the deep gap minima. Consequently, thermal conductivity
measurements on $\mathrm{Sr_2RuO_4}$ can be reconciled with a chiral $p$-wave
pairing state with deep gap minima. However, the data impose serious
constraints on such models and these constraints are examined in the context of
several different chiral $p$-wave models. |
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DOI: | 10.48550/arxiv.1810.00932 |