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Journal Articles

High-quality single crystal growth of UGe$$_2$$ and URhGe

Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Ikeda, Shugo; Inada, Yoshihiko*; Settai, Rikio*; Onuki, Yoshichika*

Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e171 - e172, 2004/05

https://doi.org/10.1016/j.jmmm.2003.12.1083
 Times Cited Count：1 Percentile：7.12(Materials Science, Multidisciplinary)

We searched for an experimental condition of crystal growth for a ferromagnetic superconductors of UGe$$_2$$ and URhGe. Samples were prepared for both polycrystalline and single crystals, which were arc-melted and grown by the Czochralski-pulling method in a tetra-arc furnace, respectively. Annealing is an important process to enhance sample-quality, namely the residual resistivity ratio. We tried to anneal the samples under various temperatures, which were wrapped by the Ta-foil and vacuum-sealed in the quartz ample, together with the solid state electrotransport method in ultra-high vacuum. The highest residual resistivity ratio was 900 for UGe$$_2$$ and 41 for URhGe.

Journal Articles

Electrical resistivity of single-crystal URhGe$$_2$$ under high pressure

Matsuda, Tatsuma; Ikeda, Shugo; Haga, Yoshinori; Yamamoto, Etsuji; Hedo, Masato*; Uwatoko, Yoshiya*; Onuki, Yoshichika

Journal of Physics; Condensed Matter, 15(28), p.S2019 - S2021, 2003/07

https://doi.org/10.1088/0953-8984/15/28/318
 Times Cited Count：1 Percentile：8.55(Physics, Condensed Matter)

We have done the pressure experiment of a ferromagnet URhGe$$_2$$ with the orthorhombic crystal structure by measuring the electrical resistivity. Two ferromagnetic ordering temperatures $$T_{rm C2}$$=30 K and $$T_{rm C2}$$=25 K indicate a different pressure dependence. $$T_{rm C2}$$ is approximately unchanged, 30 K at ambient pressure and 40 K at 6-8 GPa, while $$T_{rm C1}$$ decreases with increasing pressure and most likely becomes zero at 8 GPa. URhGe$$_2$$ is found to be ferromagnetic even at 8 GPa, and then the $$A$$ and $$rho_0$$ values of the electrical resistivity $$rho=rho_0 + AT^2$$ are unchanged against pressure.

Journal Articles

Single crystal growth and magnetic properties of ferromagnetic URhGe$$_2$$

Matsuda, Tatsuma; Haga, Yoshinori; Tokiwa, Yoshifumi; Andrei, G.; Yamamoto, Etsuji; Okubo, Tomoyuki*; Onuki, Yoshichika

Acta Physica Polonica B, 34(2), p.1071 - 1074, 2003/02

http://www.actaphys.uj.edu.pl/_cur/store/vol34/pdf/v34p1071.pdf

We have successfully grown a single crystal of uranium intermetallic compound URhGe$$_2$$. The temperature dependence of electrical resistivity shows highly anisotropic behavior. Two anomalies, which correspond to the magnetic ordering temperatures, were observed in the resistivity, magnetic susceptibility and specific heat measurements at $$T_{rm M1}$$= 30 K and $$T_{rm M2}$$=25 K. The magnetic susceptibility also shows a large uniaxial anisotropy with a magnetic easy-axis along the [010] direction.

Journal Articles

Single crystal growth and annealing temperature of ferromagnet URhGe

Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Inada, Yoshihiko*; Settai, Rikio*; Tokiwa, Yoshifumi*; Onuki, Yoshichika

Acta Physica Polonica B, 34(2), p.1059 - 1062, 2003/00

http://www.actaphys.uj.edu.pl/_cur/store/vol34/pdf/v34p1059.pdf

no abstracts in English

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