Site-dependent Local Spin Susceptibility and Low-energy Excitation in a Weyl Semimetal WTe$_2$
| Autor: | Yokoo, Toshiki, Watanabe, Yukihiro, Kumazaki, Masashi, Itoh, Masayuki, Shimizu, Yasuhiro |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 91, 054701 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7566/JPSJ.91.054701 |
| Popis: | 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 $1/T_1T$ shows a dependence of the square of temperature $T$ at high temperatures, 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 $1/T_1T$, corroborating a predominant spin contribution in low-lying excitation. The observed dependence of $K$ and $1/T_1T$ 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 $5p$ hole occupations on Te sites. Comment: 6 pages, 5 figures |
| Databáze: | arXiv |
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