Unusual Phonon Heat Transport in α−RuCl3: Strong Spin-Phonon Scattering and Field-Induced Spin Gap
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−RuCl3, a prime candidate for realizing such physics: beyond a magnetic...
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| Veröffentlicht in: | Physical review letters 2018-03, Vol.120 (11), p.117204 |
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| creator | Hentrich, Richard Wolter, Anja U B Zotos, Xenophon Brenig, Wolfram Nowak, Domenic Isaeva, Anna Doert, Thomas Banerjee, Arnab Lampen-Kelley, Paula Mandrus, David G Nagler, Stephen E Sears, Jennifer Kim, Young-June Büchner, Bernd Hess, Christian |
| description | 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−RuCl3, a prime candidate for realizing such physics: beyond a magnetic field of Bc≈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 ℏω0/kB≈50 K at 18 T. |
| doi_str_mv | 10.1103/PhysRevLett.120.117204 |
| format | Article |
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| source | American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Dependence Energy gap Excitation spectra Fermions Heisenberg theory Honeycomb construction Magnetic fields Phonons Ruthenium trichloride Scattering Spin liquid Statistical models Thermal conductivity Transport |
| title | Unusual Phonon Heat Transport in α−RuCl3: Strong Spin-Phonon Scattering and Field-Induced Spin Gap |
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