High-field thermal transport properties of the Kitaev quantum magnet α−RuCl3 : Evidence for low-energy excitations beyond the critical field

@article{Hentrich2020HighfieldTT,
  title={High-field thermal transport properties of the Kitaev quantum magnet 
$\alpha$−RuCl3
: Evidence for low-energy excitations beyond the critical field},
  author={Richard Hentrich and Xiaochen Hong and Matthias Gillig and Federico Caglieris and Matija {\vC}ulo and M. Shahrokhvand and Uli Zeitler and Maria Roslova and Anna Isaeva and Thomas Doert and Lukas Janssen and Matthias Vojta and Bernd B{\"u}chner and Christian Hess},
  journal={Physical Review B},
  year={2020}
}
We investigate the phononic in-plane longitudinal low-temperature thermal conductivity kappa_ab of the Kitaev quantum magnet alpha-RuCl3 for large in-plane magnetic fields up to 33 T. Our data reveal for fields larger than the critical field Bc ~ 8 T, at which the magnetic order is suppressed, a dramatic increase of kappa_ab at all temperatures investigated. The analysis of our data shows that the phonons are not only strongly scattered by a magnetic mode at relatively large energy which scales… 

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