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

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.