Crystal-field Γ8-like State in Magnetically Ordered Phases of CeP: Its Anisotropy and Influence on Electronic Structure via High-Field Magnetotransport Measurements

概要

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Although the crystal-field ground state in the paramagnetic phase of CeP is Γ7, part of cerium ions take a Γ8-like state in magnetically ordered phases and regular arrangements of the Γ7 and Γ8-like moments constitute magnetic structures. We have performed transverse magnetoresistance measurements up to 32 T for selected field directions and have determined phase boundaries related to the appearance of the Γ8-like state for each field direction. The result reveals the extreme uniaxial anisotropy that the Γ8-like moment is strongly bound to the [001] axis. We have also determined the field-orientation dependence of phase transitions connected with the rearrangement of the Γ7 moment via ac susceptibility measurements. The analysis of the angular dependence indicates that the Γ7 moment prefers the [001] direction only weakly probably due to the exchange field from neighboring Γ8 moments. The resistivity exhibits a sharp decrease on the appearance of the Γ8-like state. Besides, Hall effect measurements up to 26 T show a concomitant reduction of the magnitude of the Hall coefficient, and suggest the presence of the anomalous Hall effect in the magnetically ordered phases. These indicate that the appearance of the Γ8-like state is accompanied by a drastic change of the electronic structure.
Physical Society of Japanの論文
2001-12-15