Field-induced magnetic transition in the heavy-fermion antiferromagnet (formula presented)

K. Umeo, Y. Echizen, M. H. Jung, T. Takabatake, T. Sakakibara, T. Terashima, C. Terakura, C. Pfleiderer, M. Uhlarz, H. v. Löhneysen

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We present a detailed study of the field (B) - temperature (T) phase diagram of the heavy-fermion antiferromagnet (formula presented) that crystallizes in the hexagonal (formula presented)-type structure with three nonequivalent Ce sites (formula presented) (formula presented) and (formula presented) This compound undergoes two magnetic transitions at (formula presented) and (formula presented) in zero field. Below (formula presented) an incommensurate spin density wave (SDW) develops, and below (formula presented) a commensurate SDW appears independently. By applying fields along the c axis, both (formula presented) and (formula presented) are suppressed and vanish at 0.3 T. For (formula presented) however, another magnetic phase appears below 0.5 K, which was found by magnetoresistance, specific heat, and magnetization measurements. The separation of the field induced phase from the SDW phase is attributed to large spin fluctuations of (formula presented) which originate from a geometrical frustration in the quasiregular tetrahedron made of (formula presented) and (formula presented).

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - 10 Apr 2003
Externally publishedYes


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