Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy (Lu,Yb)RhZn

多軌道近藤系合金(Lu,Yb)RhZnにおける磁場誘起シングルイオン磁気異方性の観測

北澤 崇文; 池田 陽一*; 榊原 俊郎*; 松尾 晶*; 清水 悠晴*; 徳永 陽  ; 芳賀 芳範   ; 金道 浩一*; 南部 雄亮*; 池内 和彦*; 蒲沢 和也*; 大河原 学*; 藤田 全基*

Kitazawa, Takafumi; Ikeda, Yoichi*; Sakakibara, Toshiro*; Matsuo, Akira*; Shimizu, Yusei*; Tokunaga, Yo; Haga, Yoshinori; Kindo, Koichi*; Nambu, Yusuke*; Ikeuchi, Kazuhiko*; Kamazawa, Kazuya*; Okawara, Manabu*; Fujita, Masaki*

We demonstrate field-induced single-ion magnetic anisotropy resulting from the multiorbital Kondo effect on diluted ytterbium alloy (LuYb)RhZn. Single-ion anisotropic metamagnetic behavior is revealed in low-temperature regions where the local Fermi-liquid state is formed. Specific heat, low-field magnetic susceptibility, and resistivity indicate reproduction of the ground-state properties by the SU( = 8) Kondo model with a relatively large - hybridization of = 60.9 K. Dynamical susceptibility measurements on YbRhZn support realizing multiorbital Kondo ground state in (LuYb)RhZn. The single-ion magnetic anisotropy becomes evident above 5 T, which is lower than the isotropic Kondo crossover field of 22.7 T, verifying blurred low-lying crystal field states through the multiorbital Kondo effect.