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Unusual Phonon Heat Transport in α-RuCl_{3}: Strong Spin-Phonon Scattering and Field-Induced Spin Gap. 2018
Richard Hentrich, and
Anja U B Wolter, and
Xenophon Zotos, and
Wolfram Brenig, and
Domenic Nowak, and
Anna Isaeva, and
Thomas Doert, and
Arnab Banerjee, and
Paula Lampen-Kelley, and
David G Mandrus, and
Stephen E Nagler, and
Jennifer Sears, and
Young-June Kim, and
Bernd Büchner, and
Christian Hess
Leibniz Institute for Solid State and Materials Research, 01069 Dresden, Germany.
The honeycomb Kitaev-Heisenberg model is a source of a quantum spin liquid with Majorana fermions and gauge flux excitations as fractional quasiparticles. Here we unveil the highly unusual low-temperature heat conductivity κ of α-RuCl_{3}, a prime candidate for realizing such physics: beyond a magnetic field of B_{c}≈7.5 T, κ increases by about one order of magnitude, both for in-plane as well as out-of-plane transport. This clarifies the unusual magnetic field dependence unambiguously to be the result of severe scattering of phonons off putative Kitaev-Heisenberg excitations in combination with a drastic field-induced change of the magnetic excitation spectrum. In particular, an unexpected, large energy gap arises, which increases linearly with the magnetic field, reaching remarkable ℏω_{0}/k_{B}≈50 K at 18 T.
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