Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Pospil, J.*; 芳賀 芳範; 小濱 芳允*; 三宅 厚志*; 神戸 振作; 立岩 尚之; Valika, M.*; Proschek, P.*; Prokleka, J.*; Sechovsk, V.*; et al.
Physical Review B, 98(1), p.014430_1 - 014430_7, 2018/07
被引用回数:16 パーセンタイル:61.77(Materials Science, Multidisciplinary)The metamagnetic transition between the antiferromagnetic and paramagnetic state in UIrGe has been studied at various temperatures by magnetization, heat capacity, and magnetocaloric effect measurements on a single crystal in static and pulsed magnetic fields applied along the orthorhombic axis. The first-order transition is accompanied by a dramatic increase of the Sommerfeld coefficient. A tentative scenario explaining these anomalies by antiferromagnetic correlations or short-range order in the paramagnetic state is discussed.
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; 山本 悦嗣; 竹田 幸治; 岡根 哲夫; 山上 浩志*; Valika, M.*; Stunault, A.*; Gillon, B.*; Prokes, K.*; et al.
no journal, ,
We present that Ru substitution on the Co site in UCoGe leads to an initial sharp increase of the Curie temperature TC up to the maximum of 8.5 K for 12 of dopant. Further increase of the Ru content leads to the suppression of both the TC and spontaneous magnetic moment. Hand in hand with ferromagnetism increase suppression of superconductivity appears. Concentration dependence of the critical exponents of resistivity and heat capacity together with scaling of the TC has signs of the non-Fermi liquid (nFL) behavior around 30 of Ru. Latter performed PND and XMCD experiments assign ferromagnetism enhancement to growth of uranium orbital moment and mainly to dramatic transformation in Co sublattice. In contrast to parent UCoGe, we found parallel orientation of the U and Co moments in UCoRuGe and UCoRuGe single crystals.