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Journal Articles

Single crystal growth and fermi surface properties of an antiferromagnet UPdGa$$_5$$

Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Yamamoto, Etsuji; Nakashima, Miho*; Kirita, Shingo*; Kobayashi, Tatsuo*; Hedo, Masato*; Uwatoko, Yoshiya*; Yamagami, Hiroshi*; et al.

Journal of the Physical Society of Japan, 74(8), p.2277 - 2281, 2005/08

 Times Cited Count:10 Percentile:54.39(Physics, Multidisciplinary)

We have succeeded in growing a high-quality single crystal of an antiferromagnet UPdGa$$_5$$ by the Ga-flux method with the off-stoichiometric composition of U : Pd : Ga = 1 : 2 : 7.3. The electronic state has been investigated by the de Haas-van Alphen experiment, indicating the similar cylindrical Fermi surfaces as in an antiferromagnet UPtGa$$_5$$. We have also studied the pressure effect by measuring the electrical resistivity. The N$$acute{rm e}$$el temperature decreases with increasing pressure and becomes zero at 3.1 GPa. The antiferromagnetic state is changed into the paramagnetic state above 3.1 GPa.

Journal Articles

Neutron scattering study on 5f itinerant antiferromagnet UPdGa$$_5$$

Ikeda, Shugo; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Matsuda, Tatsuma; Onuki, Yoshichika

Physica B; Condensed Matter, 359-361, p.1030 - 1032, 2005/06

 Times Cited Count:1 Percentile:6.5(Physics, Condensed Matter)

We have succeeded to grow a single crystal of uranium ternary intermetallic compound UPdGa$$_5$$ by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy,consistent with an itinerant character of 5$$f$$ electrons. We observed a clear drop in the susceptibility and electrical resistivity below the Neel temperature $$T_N$$= 31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector $$Q$$=[0,0,1/2]. The uranium 5$$f$$ moment of 0.33$$mu$$$$_{B}$$ parallel to the $$c$$-axis was found to order ferromagnetically in the basal $$c$$-plane and coupled antiferromagnetically along the $$c$$-axis.

Journal Articles

Single crystal growth and magnetic properties of 5$$f$$-itinerant antiferromagnet UPdGa$$_5$$

Ikeda, Shugo; Metoki, Naoto; Haga, Yoshinori; Kaneko, Koji; Matsuda, Tatsuma; Onuki, Yoshichika; Galatanu, A.

Journal of the Physical Society of Japan, 72(10), p.2622 - 2626, 2003/10

 Times Cited Count:16 Percentile:66.52(Physics, Multidisciplinary)

A single crystal of uranium ternary intermetallic compound UPdGa$$_5$$ was grown by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy, consistent with an itinerant character of 5$$f$$ electrons. We observed a clear drop in the susceptibility and electrical resistivity below the N$'{e}$el temperature $$T_{rm N}$$= 31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector $textbf{textit{Q}}$=[0,0,1/2]. The uranium 5$$f$$ moment of 0.33$$mu_{rm B}$$/U parallel to the $$c$$-axis was found to order ferromagnetically in the basal $$c$$-plan and coupled antiferromagnetically along the $$c$$-axis.

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