Origin of oscillatory structures in the magnetothermal conductivity of the putative Kitaev magnet $α$-RuCl$_3$
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866913385363275776 |
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| author | Bruin, J. A. N. Claus, R. R. Matsumoto, Y. Nuss, J. Laha, S. Lotsch, B. V. Kurita, N. Tanaka, H. Takagi, H. |
| author_facet | Bruin, J. A. N. Claus, R. R. Matsumoto, Y. Nuss, J. Laha, S. Lotsch, B. V. Kurita, N. Tanaka, H. Takagi, H. |
| contents | The layered honeycomb magnet $α$-RuCl$_3$ has been suggested to exhibit a field-induced quantum spin liquid state, in which the reported large thermal Hall effect close to the half-quantized value still remains a subject of debate. Recently, oscillatory structures of the magnetothermal conductivity were reported and interpreted as quantum oscillations of charge-neutral particles. To investigate the origin of these oscillatory structures, we performed a comprehensive measurement of the in-plane magnetothermal conductivity $κ(H)$ down to low temperature (100 mK), as well as magnetization $M$, for single crystals grown by two different techniques: Bridgman and chemical vapor transport. The results show a series of dips in $κ(H)$ and peaks in the field derivative of $M$ located at the same fields independent of the growth method. We argue that these structures originate from field-induced phase transitions rather than quantum oscillations. The positions of several of these features are temperature-dependent and connected to the magnetic phase transitions in zero field: the main transition at 7 K and weaker additional transitions which likely arise from secondary phases at 10 K and 13 K. In contrast to what is expected for quantum oscillations, the magnitude of the structure in $κ(H)$ is smaller for the higher conductivity crystal and decreases rapidly upon cooling below 1 K. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2205_15839 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Origin of oscillatory structures in the magnetothermal conductivity of the putative Kitaev magnet $α$-RuCl$_3$ Bruin, J. A. N. Claus, R. R. Matsumoto, Y. Nuss, J. Laha, S. Lotsch, B. V. Kurita, N. Tanaka, H. Takagi, H. Strongly Correlated Electrons The layered honeycomb magnet $α$-RuCl$_3$ has been suggested to exhibit a field-induced quantum spin liquid state, in which the reported large thermal Hall effect close to the half-quantized value still remains a subject of debate. Recently, oscillatory structures of the magnetothermal conductivity were reported and interpreted as quantum oscillations of charge-neutral particles. To investigate the origin of these oscillatory structures, we performed a comprehensive measurement of the in-plane magnetothermal conductivity $κ(H)$ down to low temperature (100 mK), as well as magnetization $M$, for single crystals grown by two different techniques: Bridgman and chemical vapor transport. The results show a series of dips in $κ(H)$ and peaks in the field derivative of $M$ located at the same fields independent of the growth method. We argue that these structures originate from field-induced phase transitions rather than quantum oscillations. The positions of several of these features are temperature-dependent and connected to the magnetic phase transitions in zero field: the main transition at 7 K and weaker additional transitions which likely arise from secondary phases at 10 K and 13 K. In contrast to what is expected for quantum oscillations, the magnitude of the structure in $κ(H)$ is smaller for the higher conductivity crystal and decreases rapidly upon cooling below 1 K. |
| title | Origin of oscillatory structures in the magnetothermal conductivity of the putative Kitaev magnet $α$-RuCl$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2205.15839 |