title: Thermal Conductivity through the Quantum Critical Point in YbRh_{2}Si_{2} at Very Low Temperature.
abstract: The thermal conductivity of YbRh_{2}Si_{2} has been measured down to very low temperatures under field in the basal plane. An additional channel for heat transport appears below 30 mK, both in the antiferromagnetic and paramagnetic states, respectively, below and above the critical field suppressing the magnetic order. This excludes antiferromagnetic magnons as the origin of this additional contribution to thermal conductivity. Moreover, this low temperature contribution prevails a definite conclusion on the validity or violation of the Wiedemann-Franz law at the field-induced quantum critical point.
authors.affiliation: Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France.
authors.forename: M
authors.initials: M
authors.lastname: Taupin
authors.affiliation: Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Knebel
authors.affiliation: Advanced Science Research Center, JAEA, Tokai, Ibaraki 319-1195, Japan.|Department of Physics, Tokyo Metropolitan University 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan.
authors.forename: T D
authors.initials: TD
authors.lastname: Matsuda
authors.affiliation: Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Lapertot
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Machida
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Izawa
authors.affiliation: Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Brison
authors.affiliation: Université Grenoble Alpes, INAC-SPSMS, F-38000 Grenoble, France and CEA, INAC-SPSMS, F-38000 Grenoble, France.
authors.forename: J
authors.initials: J
authors.lastname: Flouquet