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

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

$$^{27}$$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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