2019
DOI: 10.1103/physrevb.99.184107
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Deviation from Fermi-liquid transport behavior in the vicinity of a Van Hove singularity

Abstract: Recent experiments revealed non-Fermi-liquid resistivity in the unconventional superconductor Sr 2 RuO 4 when strain pushes one of the Fermi surfaces close to a van Hove singularity. The origin of this behavior and whether it can be understood from a picture of well defined quasiparticles is unclear. We employ a Boltzmann transport analysis beyond the single relaxation-time approximation based on a single band which undergoes a Lifshitz transition, where the Fermi surface crosses a van Hove singularity, either… Show more

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Cited by 21 publications
(7 citation statements)
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“…Our prediction for the violation of the Wiedemann-Franz law is consistent with the numerical solution of the Boltzmann equation of Ref. [27], where a suppression in the Lorentz number for weakly disordered systems was seen near the Van Hove point.…”
Section: Introductionsupporting
confidence: 90%
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“…Our prediction for the violation of the Wiedemann-Franz law is consistent with the numerical solution of the Boltzmann equation of Ref. [27], where a suppression in the Lorentz number for weakly disordered systems was seen near the Van Hove point.…”
Section: Introductionsupporting
confidence: 90%
“…A careful analysis of the transport processes in systems with impurity scattering was recently performed in Ref. [27]. Interestingly, in this work a drop in the Lorentz ratio near the Van Hove singularity was found.…”
Section: Introductionmentioning
confidence: 63%
“…On the other hand, a significant increase of the T 2 coefficient associated with resistivity was reported under applied uniaxial stress 27 . This was later found to be consistent with a Boltzmann description of transport based on coherent quasiparticles close to a van-Hove singularity 29,30 .…”
Section: Introductionsupporting
confidence: 71%
“…This has been addressed in previous theoretical work, such as Refs [39] and [40] which have emphasized the logarithmic divergence of S/T in metals with a T -linear scattering rate. The Tdependence of S close to a Fermi surface Lifshitz transition has been considered in [41,42]. However, to our knowledge, the key role of a particle-hole asymmetry of the inelastic scattering rate in non-Fermi liquid metals with ω/T scaling has not been discussed before.…”
mentioning
confidence: 99%