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Incommensurate to commensurate antiferromagnetism in CeRhAl$$_4$$Si$$_2$$; An $$^{27}$$Al NMR study

CeRhAl$$_4$$Si$$_2$$における非整合・整合反強磁性; $$^{27}$$Al核NMR研究

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.*

反強磁性近藤格子系CeRhAl$$_4$$Si$$_2$$の単結晶を用いて、$$^{27}$$Al核核磁気共鳴(NMR)実験を行った。この化合物は、ゼロ磁場で$$T_{rm N1}$$=14 Kと$$T_{rm N2}$$=9 Kで反強磁性転移をする。常磁性状態において、斜方対称をもつAlサイトのナイトシフト、四重極周波数、非対称パラメーターを決定した。移行超微細結合定数も決定した。$$T_{rm N2}$$以下の反強磁性秩序が格子整合していること、$$T_{rm N2}$$以上、$$T_{rm N1}$$以下の反強磁性は非整合であることを示した。スピン格子緩和率の温度依存性から、$$T_{rm N1}$$以上で、4f電子が局在的になっていることも示した。

$$^{27}$$Al nuclear magnetic resonance (NMR) experiments have been performed on a single crystal of CeRhAl$$_4$$Si$$_2$$, which is an antiferromagnetic Kondo-lattice compound with successive antiferromagnetic transitions of $$T_{rm N1}$$=14 K and $$T_{rm N2}$$=9 K at zero external field. In the paramagnetic state, the Knight shifts, quadrupolar frequency, and asymmetric parameter of electrical field gradient on the Al sites have been determined, which have local orthorhombic symmetry. The transferred hyperfine coupling constants are also determined. Analysis of the NMR spectra indicates that a commensurate antiferromagnetic structure exists below $$T_{rm N2}$$, but an incommensurate modulation of antiferromagnetic moments is present in the antiferromagnetic state between $$T_{rm N1}$$ and $$T_{rm N2}$$. The spin-lattice relaxation rate suggests that the $$4f$$ electrons behave as local moments at temperatures above $$T_{rm N1}$$.

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パーセンタイル:88.02

分野:Materials Science, Multidisciplinary

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