Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI3

The realization of reversible thermal conductivity through ferromagnetic ordering can improve the heat management and energy efficiency in magnetic materials-based devices.Ⅵ3,as a new layered ferromagnetic semiconductor,exhibits a structural phase transition from monoclinic(C2/m)to rhombohedral(R3)p...

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Bibliographic Details
Published in:Chinese physics B 2023-04, Vol.32 (5), p.23-29
Main Authors: Wu, Chao, Liu, Chenhan
Format: Article
Language:English
Subjects:
ferromagnetic ordering
phonons
thermal switching
Online Access:Get full text
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Summary:The realization of reversible thermal conductivity through ferromagnetic ordering can improve the heat management and energy efficiency in magnetic materials-based devices.Ⅵ3,as a new layered ferromagnetic semiconductor,exhibits a structural phase transition from monoclinic(C2/m)to rhombohedral(R3)phase as temperature decreases,making it a suitable platform to investigate thermal switching in magnetic phase transition materials.This work reveals that the thermal switching ratio of Ⅵ3 can reach 3.9 along the a-axis.Mechanical properties analysis indicates that the C2/m structure is stiffer than the R3 one,causing the larger phonon velocity in C2/m phase.Moreover,due to the fewer phonon branches in C2/m phase,the number of phonon-phonon scattering channels in C2/m phase is smaller compared to that of R3 phase.Both the larger phonon velocity and the longer phonon lifetime lead to larger lattice thermal conductivity in C2/m phase.This study uncovers the mechanical and thermal properties of Ⅵ3,which provides useful guides for designing magnetic materials-based devices such as thermal switch.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/acb764