Uncompensated Antiferromagnetic Ordering of UAu<sub>2</sub>Si<sub>2</sub> Studied by <sup>29</sup>Si-NMR

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  • Chihiro Tabata
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Yoshihiko Ihara
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Shogo Shimmura
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Naoyuki Miura
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Hiroyuki Hidaka
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Tatsuya Yanagisawa
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
  • Hiroshi Amitsuka
    Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan

Description

The magnetically ordered phase of body-centered tetragonal UAu$_2$Si$_2$ was explored through $^{29}$Si-NMR experiments. The field-swept NMR spectra show asymmetric peak splitting below magnetic phase transition temperature, $T_{\rm m}$ = 20 K. This splitting is well explained by the occurrence of a magnetic order with propagation vector of $q$ = (2/3, 0, 0) and magnetic moments pointing parallel to the tetragonal [001] axis, offering evidence for uncompensated "up-up-down"-type antiferromagnetic ordering with a spontaneous [001] magnetization component. A symmetry analysis of the hyperfine-coupling tensor with phenomenological corrections including orbital and dipolar-field contributions yields the magnitude of the ordered moment to be approximately 1.4 $\pm$ 0.2 Bohr magneton per uranium ion, and evaluates the site-dependent hyperfine-coupling constants.

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