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三角近藤格子系CePtAl$$_4$$Ge$$_2$$の単結晶NMR

Single crystal NMR study of triangular Kondo lattice system CePtAl$$_4$$Ge$$_2$$

酒井 宏典   ; Shin, S.*; 神戸 振作  ; 徳永 陽  ; 播磨 尚朝*; Park, T.*

Sakai, Hironori; Shin, S.*; Kambe, Shinsaku; Tokunaga, Yo; Harima, Hisatomo*; Park, T.*

三角格子を組む近藤格子系として注目されているCePtAl$$_4$$Ge$$_2$$の単結晶を用いて$$^{27}$$Al核核磁気共鳴(NMR)実験を行った。三方晶系の結晶構造中に局所対称性の同じ結晶学的に異なるAl(1)とAl(2)サイトがある。外部磁場方向の角度依存性から電場勾配パラメーターを決定し、電子状態計算結果と比較して、サイト同定に成功した。当日は、NMR緩和率測定結果とともに、本系の磁気相互作用や磁気揺らぎについて議論する。

$$^{27}$$Al nuclear magnetic resonance (NMR) experiments were carried out on single crystals of CePtAl$$_4$$Ge$$_2$$, which is of interest as a Kondo lattice system forming a triangular lattice. There are crystallographically distinct Al(1) and Al(2) sites with the same local symmetry in the crystal structure of the triclinic system. We determined the electric field gradient parameters from the angular dependence of the external magnetic field direction. We compared them with the results of electronic structure calculations to successfully identify the sites. On the day, magnetic interactions and magnetic fluctuations in this system will be discussed with the results of NMR relaxation rate measurements.

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