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Journal Articles

Dramatic elastic response at the critical end point in UTe$$_2$$

Vali$v{s}$ka, M.*; Haidamak, T.*; Cabala, A.*; Posp$'i$$v{s}$il, J.*; Bastien, G.*; Sechovsk$'y$, V.*; Prokle$v{s}$ka, J.*; Yanagisawa, Tatsuya*; Opletal, P.; Sakai, Hironori; et al.

Physical Review Materials (Internet), 8(9), p.094415_1 - 094415_9, 2024/09

https://doi.org/10.1103/PhysRevMaterials.8.094415
 Times Cited Count：2 Percentile：21.31(Materials Science, Multidisciplinary)

Journal Articles

Quasi-2D Fermi surface in the anomalous superconductor UTe$$_2$$

Eaton, A. G.*; Weinberger, T. I.*; Popiel, N. J. M.*; Wu, Z.*; Hickey, A. J.*; Cabala, A.*; Posp$'i$$v{s}$il, J.*; Prokle$v{s}$ka, J.*; Haidamak, T.*; Bastien, G.*; et al.

Nature Communications (Internet), 15, p.223_1 - 223_10, 2024/01

https://doi.org/10.1038/s41467-023-44110-4
 Times Cited Count：42 Percentile：98.62(Multidisciplinary Sciences)

Journal Articles

Antiferromagnetism and mixed valency in the new Kondo lattice compound Ce$$_{3}$$Rh$$_{4}$$Sn$$_{7}$$

Opletal, P.; Duverger-N$'e$dellec, E.*; Miliyanchuk, K.*; Malick, S.*; Hossain, Z.*; Custers, J.*

Journal of Alloys and Compounds, 927, p.166941_1 - 166941_7, 2022/12

https://doi.org/10.1016/j.jallcom.2022.166941
 Times Cited Count：5 Percentile：28.48(Chemistry, Physical)

Journal Articles

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

Posp$'i$$v{s}$il, J.*; Haga, Yoshinori; Miyake, Atsushi*; Kambe, Shinsaku; Tokunaga, Yo; Tokunaga, Masashi*; Yamamoto, Etsuji; Proschek, P.*; Voln$'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
 Times Cited Count：7 Percentile：30.81(Materials Science, Multidisciplinary)

Journal Articles

Critical behavior of magnetization in URhAl; Quasi-two-dimensional Ising system with long-range interactions

Tateiwa, Naoyuki; Posp$'i$$v{s}$il, J.*; Haga, Yoshinori; Yamamoto, Etsuji

Physical Review B, 97(6), p.064423_1 - 064423_10, 2018/02

https://doi.org/10.1103/PhysRevB.97.064423
 Times Cited Count：14 Percentile：48.93(Materials Science, Multidisciplinary)

The critical behavior of dc magnetization in the uranium ferromagnet URhAl with the hexagonal ZrNiAl-type crystal structure has been studied around the ferromagnetic transition temperature $$T_{rm C}$$. The critical exponent $$beta$$ for the temperature dependence of the spontaneous magnetization below $$T_{rm C}$$, $$gamma$$ for the magnetic susceptibility, and $$delta$$ for the magnetic isotherm at $$T_{rm C}$$ have been obtained. We have determined the critical exponents as $$beta$$ = 0.287 $$pm$$ 0.005, $$gamma$$ = 1.47 $$pm$$ 0.02, and $$delta$$ = 6.08 $$pm$$ 0.04 by the scaling analysis and the critical isotherm analysis. These critical exponents satisfy the Widom scaling law $${delta}{,}={,}1+{,}{gamma}/{beta}$$. The determined exponents can be explained with the results of the renormalization group approach for a two-dimensional Ising system coupled with long-range interactions.

Journal Articles

Itinerant ferromagnetism in actinide $$5f$$-electron systems; Phenomenological analysis with spin fluctuation theory

Tateiwa, Naoyuki; Posp$'i$$v{s}$il, J.*; Haga, Yoshinori; Sakai, Hironori; Matsuda, Tatsuma*; Yamamoto, Etsuji

Physical Review B, 96(3), p.035125_1 - 035125_15, 2017/07

https://doi.org/10.1103/PhysRevB.96.035125
 Times Cited Count：32 Percentile：74.81(Materials Science, Multidisciplinary)

We have carried out an analysis of magnetic data in 69 uranium, 7 neptunium and 4 plutonium ferromagnets with the spin fluctuation theory developed by Takahashi (Y. Takahashi, J. Phys. Soc. Jpn. ${bf 55}$, 3553 (1986)). The basic and spin fluctuation parameters of the actinide ferromagnets are determined and the applicability of the spin fluctuation theory to actinide $$5f$$ system has been discussed. Itinerant ferromagnets of the $$3d$$ transition metals and their intermetallics follow a generalized Rhodes-Wohlfarth relation $${p_{rm eff}}/{p_{rm s}}{,}{propto}{,}({T_{rm C}}/{T_0})^{-3/2}$$. Here, $$p_{rm s}$$, $$p_{rm eff}$$, $$T_{rm C}$$, and $$T_0$$ are the spontaneous and effective magnetic moments, the Curie temperature and the width of spin fluctuation spectrum in energy space, respectively. The same relation is satisfied for $${T_{rm C}}/{T_0}< 1.0$$ in the most of the actinide ferromagnets.

Oral presentation

characteristic temperature of spin fluctuations in actinide 5f electrons systems

Tateiwa, Naoyuki; Posp$'i$$v{s}$il, J.*; Haga, Yoshinori; Sakai, Hironori; Yamamoto, Etsuji; Matsuda, Tatsuma*

no journal, , 

We have carried out an analysis of magnetic data in 69 uranium, 7 neptunium and 4 plutonium ferromagnets with the spin fluctuation theory developed by Takahashi (Y. Takahashi, J. Phys. Soc. Jpn. ${bf 55}$, 3553 (1986)). Itinerant ferromagnets of the $$3d$$ transition metals and their intermetallics follow a generalized Rhodes-Wohlfarth relation between $${p_{rm eff}}/{p_{rm s}}$$ and $${T_{rm C}}/{T_0}$$ viz., $${p_{rm eff}}/{p_{rm s}}{,}{propto}{,}({T_{rm C}}/{T_0})^{-3/2}$$. Here, $$p_{rm s}$$, $$p_{rm eff}$$, $$T_{rm C}$$ and $$T_0$$ are the spontaneous and effective magnetic moments, the Curie temperature and the width of spin fluctuation spectrum in energy space, respectively. The same relation is satisfied for $${T_{rm C}}/{T_0}< 1.0$$ in the actinide ferromagnets.

Oral presentation

Magnetization study on uranium ferromagnetic superconductor UGe$$_2$$ under high pressure

Tateiwa, Naoyuki; Haga, Yoshinori; Yamamoto, Etsuji; Posp$'i$$v{s}$il, J.*

no journal, , 

We have studied uranium ferromagnetic superconductivity of the actinide $$5f$$ electrons system. The applicability of the spin fluctuation theory to the actinide system were investigated. In the previous JPS meeting, we reported the result of the magnetization measurement on uranium ferromagnetic superconductors UGe$$_2$$. In this talk, we present the generalized Rhode-Wohlfarth relation in UGe$$_2$$ and spin fluctuation parameters in URhGe-UCoGe system.

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