Sb-NMR/NQR studies of heavy fermion system YbRhSb

International Conference on Strongly Correlated Electron Systems 2016

Kishimoto, Yasuki^1 ; Awai, Yosiki^1 ; Kotegawa, Hisashi^1 ; Tou, Hideki^1 ; Muro, Yuji^2 ; Nakamura, Koji^3 ; Sera, Masafumi^3 ; Takabatake, Toshiro^3

Department of Physics, Graduate School of Science, Kobe University, Kobe

657-8501, Japan^1

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

939-0398, Japan^2

Department of Quantum Matters, AdSM, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan^3

关键词: Antiferromagnetic state;    Asymmetry parameter;    Electric field gradients;    Heavy fermion systems;    Knight shifts;    Nuclear Magnetic Resonance (NMR);    Nuclear quadrupole;    Weak ferromagnetism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/1/012014/pdf
DOI  :  10.1088/1742-6596/807/1/012014

来源: IOP

【 摘 要 】

We report a study of121Sb nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) in a Yb-based heavy fermion system YbRhSb using a single crystal. Sharp121Sb-NMR lines were observed for each crystal axis for Ba,b,c. From comparison with observed Sb-NMR spectra and numerical simulations, electric field gradient (EFG) parameters and Knight shift parameters are obtained at 10 K. The obtained quadrupole frequency, asymmetry parameter, isotropic Knight shift and anisotropic principal values of Knight shift tensors are νQ= 18.8 MHz, , and , respectively. We also succeeded in observing121Sb-NQR signals at around 19.5 and 37 MHz, which are reproduced by the nuclear quadrupole Hamiltonian with νQ= 18.8 MHz and η = 0.2. We mention the relation between the anisotropy of the Knight shift and magnetic susceptibility. Our NMR/NQR results suggest that the weak ferromagnetism in YbRhSb is ascribed to a canted antiferromagnetic state.