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論文

Intriguing behavior of UCo$$_{1-x}$$Rh$$_x$$Ge ferromagnets in magnetic field along the $$b$$ axis

Posp$'i$$v{s}$il, J.*; 芳賀 芳範; 三宅 厚志*; 神戸 振作; 徳永 陽; 徳永 将史*; 山本 悦嗣; Proschek, P.*; Voln$'y$, J.*; Sechovsk$'y$, V.*

Physical Review B, 102(2), p.024442_1 - 024442_13, 2020/07

https://doi.org/10.1103/PhysRevB.102.024442
 被引用回数：6 パーセンタイル：38.95(Materials Science, Multidisciplinary)

Alloying study of ferromagnetic superconductors URhGe and UCoGe is reported. The Curie temperature shows a maximum at Rh concentration $$x$$ = 0.4 in UCo$$_{1-x}$$Rh$$_x$$Ge. Magnetic characteristices in low- and high-$$x$$ regions are significantly different each other. The relationship between magnetism and superconductivity are discussed.

論文

Magnetic field induced phenomena in UIrGe in fields applied along the $$b$$ axis

Posp$'i$$v{s}$il, J.*; 芳賀 芳範; 小濱 芳允*; 三宅 厚志*; 神戸 振作; 立岩 尚之; Vali$v{s}$ka, M.*; Proschek, P.*; Prokle$v{s}$ka, J.*; Sechovsk$'y$, V.*; et al.

Physical Review B, 98(1), p.014430_1 - 014430_7, 2018/07

https://doi.org/10.1103/PhysRevB.98.014430
 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 $$b$$ 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.

口頭

Evolution of ferromagnetism in Ru doped UCoGe studied by PND and XMCD

Pospisil, J.; 芳賀 芳範; 山本 悦嗣; 竹田 幸治; 岡根 哲夫; 山上 浩志*; Vali$v{s}$ka, 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 UCo$$_{0.96}$$Ru$$_{0.03}$$Ge and UCo$$_{0.88}$$Ru$$_{0.12}$$Ge single crystals.

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