Dilution effects on the antiferromagnetic Kondo semiconductor CeOs2Al10

International Conference on Strongly Correlated Electron Systems 2016

Okada, Y.^1 ; Kawabata, J.^1 ; Yamada, Y.^1 ; Muro, Y.^3 ; Takabatake, T.^1,2

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

739-8530, Japan^1

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

739-8530, Japan^2

Faculty of Engineering, Toyama Prefectural University, Toyama, Izumi

939-0398, Japan^3

关键词: Antiferromagnetic orders;    Antiferromagnetics;    C-f hybridization;    Dilution effect;    Effective magnetic moments;    High temperature;    Hole-doped systems;    Kondo semiconductors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/2/022003/pdf
DOI  :  10.1088/1742-6596/807/2/022003

来源: IOP

【 摘 要 】

We have studied the effects of dilution of Ce sublattice on the unusual antiferromagnetic (AFM) order in the Kondo semiconductor CeOs2Al10at 28.5 K by the magnetic, transport and specific-heat measurements of single crystals of Ce1-zLazOs2Al10. The effective magnetic moment and paramagnetic Curie temperature hardly change with z up to 0.5, indicating that the 4f state remains unchanged at high temperatures. The suppression of the Néel temperature TNis much weaker than that in 5d hole doped system, Ce(Os1-yRey)2Al10. Therefore, the AFM interaction is robust against the violation of the coherent Ce sublattice. The activation energy in the resistivity decreases in parallel with TN, confirming the argument that the presence of the c-f hybridization gap is a requisite for the unusual AFM order in this system.