Inelastic Neutron Scattering Study of Phonon Dispersion Relation in Higher Manganese Silicides

被引：1

作者：

Belanger, Randy ^{[1
]}

Clancy, James Patrick ^{[1
]}

Jain, Sheetal ^{[1
]}

Yamani, Zahra ^{[2
]}

Tseng, Yu-Chih ^{[3
]}

Kim, Young-June ^{[1
]}

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Canadian Neutron Beam Ctr, Natl Res Council, Chalk River, ON K0J 1J0, Canada

[3] Nat Resources Canada, CanmetMAT, Hamilton, ON L8P 0A5, Canada

来源：

CRYSTALS | 2023年 / 13卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

inelastic neutron scattering; thermoelectric materials; higher manganese silicide; phonon dispersion relation; THERMOELECTRIC PERFORMANCE; CRYSTAL-STRUCTURE;

D O I：

10.3390/cryst13050741

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We report inelastic neutron scattering (INS) measurements of the phonon dispersion relation in higher manganese silicides (HMSs). A large ingot of HMS is synthesized using a slow cooling method, which is found to have Mn15Si26 as the primary phase. The sample is composed of highly oriented crystallites as confirmed by a neutron pole-figure study and thermal conductivity data. Our INS results are mostly consistent with earlier experimental and theoretical phonon studies in HMS, including the presence of a low-lying twisting mode. However, some discrepancies are also observed. Most notably, a 5 meV gap at the zone center and the softer dispersion relation of the low-lying twisting mode. We discuss the potential origins of these observations and their implications for the thermal properties of HMS.

引用

页数：12

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