Uniaxial pressure effects on the unusual antiferromagnetic transition in the Kondo semiconductor CeOs2Al10

International Conference on Strongly Correlated Electron Systems 2016

Hayashi, Kyosuke^1 ; Umeo, Kazunori^1,2 ; Yamada, Yoshihiro^1 ; Kawabata, Jo^1 ; Muro, Yuji^4 ; Takabatake, Toshiro^1,3

Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima

739-8530, Japan^1

Cryogenics and Instrumental Analysis Division, N-BARD, Hiroshima University, Higashi-Hiroshima, Hiroshima

739-8526, Japan^2

Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima, Hiroshima

739-8530, Japan^3

Department of Intelligent Systems Design Engineering, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama

939-0398, Japan^4

关键词: Antiferromagnetic orders;    Antiferromagnetic transition;    Atomic displacement;    C-f hybridization;    Kondo semiconductors;    Ordering temperature;    Uniaxial pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/2/022002/pdf
DOI  :  10.1088/1742-6596/807/2/022002

来源: IOP

【 摘 要 】

We have studied the relation between the unusual antiferromagnetic (AFM) ordering and anisotropic c-f hybridization in CeOs2Al10by measuring the magnetic susceptibility χ under uniaxial pressures P up to 0.45 GPa. For P // B // a and P // B // c, the AFM ordering temperature TN= 28.5 K hardly changes with increasing P, while the value of χ decreases and the maximal temperature of χ(T) shifts to higher temperatures. These findings suggest that the intensity of c-f hybridization is enhanced along the pressurized a and c axes. On the other hand, for P // b, TNincreases up to 30 K at 0.15 GPa, while the value of χ remains unchanged. This observation for P // b suggests that the net intensity of c-f hybridization decreases, while the c-f hybridization along the b-axis hardly changes. We discuss these results in terms of the atomic displacements of Os, Al(3) and Al(4) under uniaxial pressures.