Anisotropies of thermal conductivity of SrIr4In2Ge4 and EuIr4In2Ge4 crystals: Manifestation of coupling of phonons with europium spin 1D fluctuations?

被引：0

作者：

Stachowiak, Piotr ^{[1
]}

Babij, Michal ^{[1
]}

Szewczyk, Daria ^{[1
]}

Bukowski, Zbigniew ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2 Str, PL-50422 Wroclaw, Poland

来源：

JOURNAL OF CHEMICAL PHYSICS | 2023年 / 159卷 / 19期

关键词：

HYBRIDIZATION GAP; HEAT-CONDUCTION; LATTICE;

D O I：

10.1063/5.0170585

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report the results of measurements of thermal conductivity coefficient dependence on temperature of single crystals of SrIr4In2Ge4 and EuIr4In2Ge4. The measurements were carried out over the temperature range of similar to 5-300 K. The EuIr4In2Ge4 crystal, unlike its strontium analog SrIr4In2Ge4, shows an amazing anisotropy: At low temperatures, it displays significantly smaller thermal conductivity in the ab plane than in the direction of c axis, while at the high ones the thermal conductivity in the direction perpendicular to the c axis increases well above that of in the c axis. The observed phenomena may be a result of the interaction of phonons with 1D chains of short-range ordered magnetic moment of europium atoms and the exchange energy between the chains in the paramagnetic phase of EuIr4In2Ge4.

引用

页数：8

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