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Pospisil, J.; Opletal, P.*; Valika, M.*; 徳永 陽; Stunault, A.*; 芳賀 芳範; 立岩 尚之; Gillon, B.*; 本多 史憲*; 山村 朝雄*; et al.
Journal of the Physical Society of Japan, 85(3), p.034710_1 - 034710_10, 2016/03
被引用回数:9 パーセンタイル:55.48(Physics, Multidisciplinary)We have investigated the ferromagnetic (FM) phase, which suddenly develops in UCoRuAl and is isolated by paramagnetic regions on both sides from the parent UCoAl and URuAl. We conclude that both criticalities are influenced by disorder. Criticality on the UCoAl side has character of a clean FM metal, while on the Ru rich side it has the character of a magnetically inhomogeneous system involving a Griffiths phase.
Pospisil, J.; 芳賀 芳範; 立岩 尚之; 山本 悦嗣
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UCoAl and URuAl remain paramagnetic at temperatures at least down to 30 mK. At He temperatures, UCoAl shows a metamagnetic transition at a magnetic field of 0.6 T applied along the c-axis. Despite the paramagnetism of parent compounds a huge dome of stable ferromagnetism exists over a wide concentration range of pseudoternary UCoRuAlcompounds. For x 0.4, there seems to exist two ferromagnetic phases depending on temperature. We have grown three single crystals of the representative composition x = 0.56, 0.70 and 0.78, respectively, and investigated the character and temperature range of stability of the two ferromagnetic phases. A scenario will be discussed considering different coherence of the two magnetically ordered phases.