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We find that a field-suppression effect on the longitudinal thermal conductivity K-xx, sets in below approximately 25 K. This field-suppression effect at 15 T becomes as large as 80% at low temperatures, suggesting a large spin contribution [Formula: see text] in K-xx. We also find clear thermal Hall signals in the spin liquid phase in all Cd-K samples. The magnitude of the thermal Hall conductivity K-xy shows a significant dependence on the sample\u0027s scattering time, as seen in the rise of the peak K-xy value in almost linear fashion with the magnitude of K-xx. On the other hand, the temperature dependence of K-xy is similar in all Cd-K samples; K-xy shows a peak at almost the same temperature of the peak of the phonon thermal conductivity [Formula: see text] which is estimated by K-xx, at 15 T. These results indicate the presence of a dominant phonon thermal Hall [Formula: see text] at 15 T. In addition to [Formula: see text], we find that the field dependence of K-xy at low fields turns out to be nonlinear at low temperatures, concomitantly with the appearance of the field suppression of K-xx, indicating the presence of a spin thermal Hall [Formula: see text] at low fields. Remarkably, by assembling the K-xx dependence of [Formula: see text] data of other kagome antiferromagnets, we find that, whereas [Formula: see text] stays a constant in the low-K-xx region, [Formula: see text] starts to increase as K-xx does in the high-K-xx region. This K-xx dependence of [Formula: see text] indicates the presence of both intrinsic and extrinsic mechanisms in the spin thermal Hall effect in kagome antiferromagnets. Furthermore, both [Formula: see text] and [Formula: see text], disappear in the antiferromagnetic ordered phase at low fields, showing that phonons alone do not exhibit the thermal Hall effect. 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Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite
https://oist.repo.nii.ac.jp/records/1885
https://oist.repo.nii.ac.jp/records/1885ad47448e-26b8-475e-b99d-298cbbce91de
名前 / ファイル | ライセンス | アクション |
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Akazawa-2020-Thermal Hall Effects of Spins and (1.1 MB)
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Creative Commons Attribution 4.0 International(https://creativecommons.org/licenses/by/4.0/)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-01-18 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者(英) |
Akazawa, Masatoshi
× Akazawa, Masatoshi× Shimozawa, Masaaki× Kittaka, Shunichiro× Sakakibara, Toshiro× Okuma, Ryutaro× Hiroi, Zenji× Lee, Hyun-Yong× Kawashima, Naoki× Han, Jung Hoon× Yamashita, Minoru |
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書誌情報 |
en : Physical Review X 巻 10, 号 4, p. 041059, 発行日 2020-12-23 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We investigate the thermal-transport properties of the kagome antiferromagnet Cd-kapellasite (Cd-K). We find that a field-suppression effect on the longitudinal thermal conductivity K-xx, sets in below approximately 25 K. This field-suppression effect at 15 T becomes as large as 80% at low temperatures, suggesting a large spin contribution [Formula: see text] in K-xx. We also find clear thermal Hall signals in the spin liquid phase in all Cd-K samples. The magnitude of the thermal Hall conductivity K-xy shows a significant dependence on the sample's scattering time, as seen in the rise of the peak K-xy value in almost linear fashion with the magnitude of K-xx. On the other hand, the temperature dependence of K-xy is similar in all Cd-K samples; K-xy shows a peak at almost the same temperature of the peak of the phonon thermal conductivity [Formula: see text] which is estimated by K-xx, at 15 T. These results indicate the presence of a dominant phonon thermal Hall [Formula: see text] at 15 T. In addition to [Formula: see text], we find that the field dependence of K-xy at low fields turns out to be nonlinear at low temperatures, concomitantly with the appearance of the field suppression of K-xx, indicating the presence of a spin thermal Hall [Formula: see text] at low fields. Remarkably, by assembling the K-xx dependence of [Formula: see text] data of other kagome antiferromagnets, we find that, whereas [Formula: see text] stays a constant in the low-K-xx region, [Formula: see text] starts to increase as K-xx does in the high-K-xx region. This K-xx dependence of [Formula: see text] indicates the presence of both intrinsic and extrinsic mechanisms in the spin thermal Hall effect in kagome antiferromagnets. Furthermore, both [Formula: see text] and [Formula: see text], disappear in the antiferromagnetic ordered phase at low fields, showing that phonons alone do not exhibit the thermal Hall effect. A high field above approximately 7 T induces [Formula: see text], concomitantly with a field-induced increase of K-xx and the specific heat, suggesting a coupling of the phonons to the field-induced spin excitations as the origin of [Formula: see text]. | |||||
出版者 | ||||||
出版者 | American Physical Society. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2160-3308 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1103/PhysRevX.10.041059 | |||||
権利 | ||||||
権利情報 | © 2020 American Physical Society. | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.041059 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 |