Thermal conductivity and magnetic phase diagram of CuB2O4

Takayuki Kawamata, Naoki Sugawara, Siyed Mohammad Haidar, Tadashi Adachi, Takashi Noji, Kazutaka Kudo, Norio Kobayashi, Yutaka Fujii, Hikomitsu Kikuchi, Meiro Chiba, German A. Petrakovskii, Mikhail A. Popov, Leonard N. Bezmaternykh, Yoji Koike

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Abstract

We have measured temperature and magnetic field dependences of the thermal conductivity along the c-axis, κc, and that along the [110] direction, κ110, of CuB2O4 single crystals in zero field and magnetic fields along the c-axis and along the [110] direction. It has been found that the thermal conductivity is nearly isotropic and very large in zero field and that the thermal conductivity due to phonons is dominant in CuB2O4. The temperature and field dependences of κc and κ110 have markedly changed at phase boundaries in the magnetic phase diagram, which has been understood to be due to the change of the mean free path of phonons caused by the change of the phonon-spin scattering rate at the phase boundaries. It has been concluded that thermal conductivity measurements are very effective for detecting magnetic phase boundaries.

Original languageEnglish
Article number114708
Journaljournal of the physical society of japan
Volume88
Issue number11
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kawamata, T., Sugawara, N., Haidar, S. M., Adachi, T., Noji, T., Kudo, K., Kobayashi, N., Fujii, Y., Kikuchi, H., Chiba, M., Petrakovskii, G. A., Popov, M. A., Bezmaternykh, L. N., & Koike, Y. (2019). Thermal conductivity and magnetic phase diagram of CuB2O4 journal of the physical society of japan, 88(11), [114708]. https://doi.org/10.7566/JPSJ.88.114708