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Anisotropy of spin fluctuations in a tetragonal heavy fermion antiferromagnet CeRhAl$$_4$$Si$$_2$$

重い電子系正方晶反強磁性体CeRhAl$$_4$$Si$$_2$$におけるスピン揺らぎの異方性

酒井 宏典; 服部 泰佑; 徳永 陽; 神戸 振作; Ghimire, N. J.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Sakai, Hironori; Hattori, Taisuke; Tokunaga, Yo; Kambe, Shinsaku; Ghimire, N. J.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

単結晶CeRhAl$$_4$$Si$$_2$$において、$$^{27}$$Al核磁気共鳴(NMR)実験を行った。常磁性状態において、ナイトシフト、四重極周波数、電場勾配の非対称パラメータを求め、超微細結合定数も決定した。緩和率は、高温において4$$f$$電子が局在していることを示唆しており、低温NMRスペクトル解析から、この系の反強磁性磁気構造について議論する。

$$^{27}$$Al NMR experiments have been performed using a single crystal of CeRhAl$$_4$$Si$$_2$$. In the paramagnetic state, Knight shifts, quadrupolar frequency, and asymmetric parameter of electrical field gradient on the Al sites have been determined, which has a local orthorhombic symmetry. The transferred hyperfine coupling constants are also determined. The relaxation rates suggest that 4$$f$$ electrons behave as local moments in the high temperatures. From the NMR spectral analyses, the antiferromagnetic structures are discussed.

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