TY  - JOUR
AU  - Yang, Kunya
AU  - Wu, Hong
AU  - Li, Zefang
AU  - Ran, Chen
AU  - Wang, Xiao
AU  - Zhu, Fengfeng
AU  - Gong, Xiangnan
AU  - Liu, Yan
AU  - Wang, Guiwen
AU  - Zhang, Long
AU  - Mi, Xinrun
AU  - Wang, Aifeng
AU  - Chai, Yisheng
AU  - Su, Yixi
AU  - Wang, Wenhong
AU  - He, Mingquan
AU  - Yang, Xiaolong
AU  - Zhou, Xiaoyuan
TI  - Spin‐Phonon Scattering‐Induced Low Thermal Conductivity in a van der Waals Layered Ferromagnet Cr$_2$Si$_2$Te$_6$
JO  - Advanced functional materials
VL  - 33
IS  - 37
SN  - 1616-301X
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2023-02257
SP  - 2302191
PY  - 2023
AB  - Layered van der Waals (vdW) magnets are prominent playgrounds for developing magnetoelectric, magneto-optic, and spintronic devices. In spintronics, particularly in spincaloritronic applications, low thermal conductivity (κ) is highly desired. Herein, by combining thermal transport measurements with density functional theory calculations, this study demonstrates low κ down to 1 W m−1 K−1 in a typical vdW ferromagnet Cr2Si2Te6. In the paramagnetic state, development of magnetic fluctuations way above Tc = 33 K strongly reduces κ via spin-phonon scattering, leading to low κ ≈ 1 W m−1 K−1 over a wide temperature range, in comparable to that of amorphous silica. In the magnetically ordered state, emergence of resonant magnon-phonon scattering limits κ below ≈2 W m−1 K−1, which will be three times larger if magnetic scatterings are absent. Application of magnetic fields strongly suppresses the spin-phonon scattering, giving rise to large enhancements of κ. This study's calculations well capture these complex behaviors of κ by taking the temperature- and magnetic-field-dependent spin-phonon scattering into account. Realization of low κ, which is easily tunable by magnetic fields in Cr2Si2Te6, may further promote spincaloritronic applications of vdW magnets. This study's theoretical approach may also provide a generic understanding of spin-phonon scattering, which appears to play important roles in various systems.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000998877100001
DO  - DOI:10.1002/adfm.202302191
UR  - https://juser.fz-juelich.de/record/1008217
ER  -