Paramagnetic-to-nonmagnetic transition in antiperovskite nitride Cr3GeN studied by 14N-NMR and ?SR

International Workshop on Itinerant-Electron Magnetism

Takao, K.^1 ; Liu, Z.^1 ; Uji, K.^1 ; Waki, T.^1 ; Tabata, Y.^1 ; Watanabe, I.^2 ; Nakamura, H.^1

Department of Materials Science and Engineering, Kyoto University, Kyoto

606-8501, Japan^1

Advanced Meson Science Laboratory, RIKEN Nishina Center, Wako

351-0198, Japan^2

关键词: Antiferromagnetic long-range orders;    Korringa relations;    Magnetic ground state;    Muon spin relaxation;    Structural transitions;    Temperature dependence;    Temperature independents;    Tetragonal structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/868/1/012021/pdf
DOI  :  10.1088/1742-6596/868/1/012021

来源: IOP

【 摘 要 】

The antiperovskite-related nitride Cr3GeN forms a tetragonal structure with the space group at room temperature. It shows a tetragonal () to tetragonal (I4/mcm) structural transition with a large hysteresis at 300-400 K. The magnetic susceptibility of Cr3GeN shows Curie-Weiss type temperature dependence at high temperature, but is almost temperature-independent below room temperature. We carried out μSR and14N-NMR microscopy measurements to reveal the magnetic ground state of Cr3GeN. Gradual muon spin relaxation, which is nearly temperature-independent below room temperature, was observed, indicating that Cr3GeN is magnetically inactive. In the14N-NMR measurement, a quadrupole-split spectrum was obtained at around14K = 0. The temperature dependence of14(1/T1) satisfies the Korringa relation. These experimental results indicate that the ground state of Cr3GeN is Pauli paramagnetic, without antiferromagnetic long-range order.