Glasslike cross-plane thermal conductivity of the kagome metals RbV3Sb5 and CsV3Sb5

被引：9

作者：

Pang, Yu ^{[1
,2
]}

Liu, Jinjin ^{[3
,4
]}

Fan, Xuanhui ^{[5
]}

Yang, Haobo ^{[1
]}

Zhu, Jie ^{[5
]}

Wang, Zhiwei ^{[3
,4
,6
]}

Yao, Yugui ^{[3
,4
,6
]}

Qian, Xin ^{[1
]}

Yang, Ronggui ^{[1
,2
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

[3] Beijing Inst Technol, Ctr Quantum Phys, Sch Phys, Key Lab Adv Optoelect Quantum Architecture & Measu, Beijing 100081, Peoples R China

[4] Beijing Inst Technol, Beijing Key Lab Nanophoton & Ultrafine Optoelect S, Beijing 100081, Peoples R China

[5] Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China

[6] Beijing Inst Technol, Yangtze Delta Reg Acad, Mat Sci Ctr, Jiaxing 314011, Peoples R China

来源：

PHYSICAL REVIEW B | 2023年 / 108卷 / 20期

基金：

中国国家自然科学基金; 国家重点研发计划; 北京市自然科学基金;

关键词：

CHARGE; ALPHA-AL2O3; ORDER;

D O I：

10.1103/PhysRevB.108.205112

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, we report on the thermal conductivity of RbV3Sb5 and CsV3Sb5 with three-dimensional charge density wave phase transitions from 40 to 500 K measured by pump-probe thermoreflectance techniques. At room temperature, the in-plane (basal plane) thermal conductivities are found to be moderate, with 12W m-1 K-1 of RbV3Sb5 and 8.8 W m-1 K-1 of CsV3Sb5, and ultralow cross-plane (stacking direction) thermal conductivities are observed, with 0.72 W m-1 K-1 of RbV3Sb5 and 0.49 W m-1 K-1 of CsV3Sb5. A unique glasslike tempera-ture dependence in the cross-plane thermal conductivity is observed, which decreases monotonically even lower than the Cahill-Pohl limit as the temperature decreases below the phase transition point TCDW. This temperature dependence is found to obey the hopping transport picture. In addition, a peak in cross-plane thermal conductivity is observed at TCDW as a fingerprint of the modulated structural distortion along the stacking direction.

引用

页数：10

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