NMR studies on heavy fermion and conventional metal superlattices CeCoIn5/YbCoIn5

International Conference on Strongly Correlated Electron Systems 2016

Yamanaka, T.^1 ; Shimozawa, M.^2 ; Endo, R.^1 ; Mizukami, Y.^3 ; Shishido, H.^4 ; Terashima, T.^5 ; Shibauchi, T.^1,3 ; Matsuda, Y.^1 ; Ishida, K.^1

Department of Physics, Kyoto University, Kyoto

606-8502, Japan^1

Institute for Solid State Physics, University of Tokyo, Chiba, Kashiwa

277-8581, Japan^2

Department of Advanced Materials Science, University of Tokyo, Chiba, Kashiwa

277-8561, Japan^3

Department of Physics and Electronics, Osaka Prefecture University, Osaka, Sakai

599-8531, Japan^4

Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto

606-8501, Japan^5

关键词: Antiferromagnetic spin fluctuations;    Different thickness;    Field dependence;    Heavy fermion;    Interfacial layer;    Interfacial sites;    Nuclear Magnetic Resonance (NMR);    Nuclear spin lattice relaxation rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/1/012004/pdf
DOI  :  10.1088/1742-6596/807/1/012004

来源: IOP

【 摘 要 】

We performed nuclear magnetic resonance (NMR) experiments on heavy fermion and conventional metal superlattices CeCoIn5/YbCoIn5. We succeeded in identifying the signals arising from CeCoIn5and YbCoIn5block layers (BLs) by comparing the spectra of the CeCoIn5/YbCoIn5superlattices, CeCoIn5thin film, and YbCoIn5thin film. Furthermore, we found that the signals of Ce-BLs could be divided into signals arising from interfacial layers and inner layers even in one Ce-BL by comparing the spectra of two CeCoIn5/YbCoIn5superlattices with different thickness of the Ce-BLs. A comparison of the spectra of the superlattices with different Ce-BL thickness and field dependence of nuclear-spin lattice relaxation rate 1/T1indicate that antiferromagnetic spin fluctuations at the interfacial site are more suppressed than those at the inner layer site even in the Ce-BLs.