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Journal Articles

Thermodynamic study on non-centrosymmetric superconductor UIr by ac calorimetry under high pressure

Tateiwa, Naoyuki; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Ikeda, Shugo; Onuki, Yoshichika*

High Pressure Research, 26(4), p.471 - 474, 2006/12

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

We investigated non-centrosymmetric compounds CePt$$_3$$Si and UIr by the ac heat capacity measurement under pressures. The pressure phase diagrams are determined. In CePt$$_3$$Si, the N$'e$el temperature $$T_{rm N}$$ = 2.2 K decreases with increasing pressure and becomes zero at the critical pressure $$P_{rm AF}$$ $$simeq$$ 0.6 GPa. On the other hand, the superconducting phase exists in a wider pressure region from ambient pressure to about 1.5 GPa. The phase diagram of CePt$$_3$$Si is thus very unique. In the ferromagnetic compound UIr where successive ferromagnetic transitions appear under pressure, the heat capacity shows an anomaly at the Curie temperature $$T_{rm C1}$$ and this anomaly shifts to lower temperatures with increasing pressure. The present pressure dependence of $$T_{rm C1}$$ was consistent with the previous works by the resistivity and magnetization measurements.

Journal Articles

Electrical and structural properties of YH$$_{x}$$(${it x}$ $$sim$$3) under high pressure

Matsuoka, Takehiro*; Kitayama, Takayasu*; Shimizu, Katsuya*; Nakamoto, Yuki*; Kagayama, Tomoko*; Aoki, Katsutoshi; Oishi, Yasuo*; Takemura, Kenichi*

High Pressure Research, 26(4), p.391 - 394, 2006/12

 Times Cited Count:1 Percentile:11.54(Physics, Multidisciplinary)

The electrical and structural properties of yttrium hydride YHx was studied by the in-situ measurements of the electrical resistance and X-ray diffraction up to 86 GPa. The electrical resistivity increased with applying pressure up to 10 GPa and showed a maximum which accompanied with the structural transition of metal lattice from hcp to fcc structure. In fcc phase the resistivity decreased significantly, however the value still remained larger by 4 orders of magnitude that that of pure yttrium metal. We could not confirm the insulator to metal transition up to 23 GPa. The resistivity showed another maximum in the large pressure region 40 $$sim$$ 60 GPa without the structural phase transition of metal lattice.

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