Ultralow-Temperature Thermal Conductivity of the Kitaev Honeycomb Magnet α-RuCl_{3} across the Field-Induced Phase Transition

Physical Review Letters
Y J YuS Y Li

Abstract

Recently, there have been increasingly hot debates on whether there exists a quantum spin liquid in the Kitaev honeycomb magnet α-RuCl_{3} in a high magnetic field. To investigate this issue, we perform ultralow-temperature thermal conductivity measurements on single crystals of α-RuCl_{3} down to 80 mK and up to 9 T. Our experiments clearly show a field-induced phase transition occurring at μ_{0}H_{c}≈7.5  T, above which the magnetic order is completely suppressed. The minimum of thermal conductivity at 7.5 T is attributed to the strong scattering of phonons by magnetic fluctuations. Most importantly, above 7.5 T, we do not observe any significant contribution of thermal conductivity from gapless magnetic excitations, which puts a strong constraint on the nature of the high-field phase of α-RuCl_{3}.

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Citations

Dec 7, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Huan-Cheng YangZhong-Yi Lu
Jun 11, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Lukas Janssen, Matthias Vojta
Jun 9, 2018·Physical Review Letters·Y KasaharaY Matsuda
Feb 12, 2020·Science Advances·Ruidan ZhongRobert J Cava
Jun 26, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Nathan EpiscopoHarikrishnan S Nair
Nov 8, 2018·The Journal of Physical Chemistry Letters·Hang LiuSheng Meng

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