Anisotropic magnetic field-temperature phase diagrams in CeCoSi

日高 宏之*; 柳谷 駿*; 小野寺 進太朗*; 柳澤 達也*; 網塚 浩*; 谷田 博司*; 石飛 尊之

Hidaka, Hiroyuki*; Yanagiya, Shun*; Onodera, Shintaro*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*; Tanida, Hiroshi*; Ishitobi, Takayuki

We investigated the magnetic-field direction anisotropy of the unknown ordered phase in the tetragonal compound CeCoSi through bulk physical property measurements. The anisotropy in the field direction, previously identified in X-ray diffraction experiments, where a field-induced phase appears along [100] but not along [110], was confirmed in the bulk properties. Combining these experimental results with Landau theory, we infer that the field-induced phase in the [100] direction emerges under an infinitesimally small magnetic field.