Thermal diffusivity and its lower bound in orthorhombic SnSe
The orthorhombic monochalcogenide SnSe has attracted much attention in recent years as a promising high-temperature thermoelectric material. We present a study of its thermal conductivity and specific heat of SnSe between 2 K and 300 K and quantify its anisotropic thermal diffusivity D . For both cr...
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| Veröffentlicht in: | Physical review. B 2021-07, Vol.104 (3), p.1, Article 035208 |
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| container_title | Physical review. B |
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| creator | Martelli, Valentina Abud, Fabio Jiménez, Julio Larrea Baggio-Saitovich, Elisa Zhao, Li-Dong Behnia, Kamran |
| description | The orthorhombic monochalcogenide SnSe has attracted much attention in recent years as a promising high-temperature thermoelectric material. We present a study of its thermal conductivity and specific heat of SnSe between 2 K and 300 K and quantify its anisotropic thermal diffusivity D . For both crystallographic orientations, thermal diffusivity remains above the recently identified Planckian limit ( D > vs2 τ P , where vs is the sound velocity and τ P = ℏ / k B T ) and its anisotropy in D is set by the anisotropy of vs. Comparison with cubic members of the IV-VI family leads to a consistent picture, where the diffusivity in all members of the family is set by the product of vs, τ P and the 'melting' velocity derived from the melting temperature. |
| doi_str_mv | 10.1103/PhysRevB.104.035208 |
| format | Article |
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| source | American Physical Society Journals |
| subjects | Acoustic velocity Anisotropy Crystallography Diffusivity High temperature Lower bounds Melt temperature Physics Thermal conductivity Thermal diffusivity Thermoelectric materials |
| title | Thermal diffusivity and its lower bound in orthorhombic SnSe |
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