Site-Dependent Local Spin Susceptibility and Low-Energy Excitation in a Weyl Semimetal WTe2
Site-Dependent Local Spin Susceptibility and Low-Energy Excitation in a Weyl Semimetal WTe2
复制标题
DOI：
10.7566/jpsj.91.054701
复制
发表时间：
2022-04
影响因子：
1.7
通讯作者：
Toshiki Yokoo;Y. Watanabe;Masashi Kumazaki;M. Itoh;Y. Shimizu
中科院分区：
文献类型：
--
作者：
Toshiki Yokoo;Y. Watanabe;Masashi Kumazaki;M. Itoh;Y. Shimizu
利用\(^{125}Te\)核磁共振对 Weyl半金属\(WTe_2\)中与位点相关的局域自旋磁化率进行了研究。核自旋 - 晶格弛豫率\(1/T_1T\)在高温时呈现出温度\(T\)的平方关系，在低于\(50K\)时呈现出常数行为。这种温度依赖特性表明Weyl费米子出现在线性交叉能带附近。奈特位移\(K\)与\(\sqrt{1/T_1T}\)成正比，证实了在低能激发中自旋起主要作用。观测到的\(K\)和\(1/T_1T\)对四个\(Te\)位点的依赖性表明了与位点相关的电子关联和态密度。核磁共振谱的角度分布给出了各向异性的超精细耦合张量，这与\(Te\)位点上的\(5p\)空穴占据情况相符。
Site-dependent local spin susceptibility is investigated with 125 Te nuclear magnetic resonance in a Weyl semimetal WTe 2 . The nuclear spin-lattice relaxation rate 1 / T 1 T shows a dependence of the square of temperature T at high tem-peratures, followed by a constant behavior below 50 K. The temperature dependence features Weyl fermions appearing around the linearly crossing bands. The Knight shift K scales to the square root of 1 / T 1 T , corroborating a predominant spin contribution in low-lying excitation. The observed dependence of K and 1 / T 1 T on the four Te sites shows the site-dependent electron correlation and density of states. The angular profile of the NMR spectrum gives the anisotropic hyperfine coupling tensor, consistent with 5 p hole occupations on Te sites.