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Journal Articles

Electrical resistivity measurements of single crystalline $$alpha$$-Mn under high pressure

Miyake, Atsushi*; Kanemasa, Tsunehiro*; Yagi, Ryohei*; Kagayama, Tomoko*; Shimizu, Katsuya*; Haga, Yoshinori; Onuki, Yoshichika

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e222 - e224, 2007/03

We have measured electrical resistivity of single crystalline $$alpha$$-manganese ($$alpha$$-Mn) under high pressure. $$alpha$$-Mn shows an antiferromagnetic ordering at $$T_{rm N}$$ = 95 K and has four inequivalent crystal sites with different magnetic moments. With increasing pressure, $$T_{rm N}$$ shifts toward lower temperature. At higher pressure, the shape of anomaly at $$T_{rm N}$$ changes to a kink-like one, which may indicate different magnetic ordering from that at lower pressure. Such a difference between lower and higher pressure regions is considered to be caused by the four inequivalent magnetic moments in $$alpha$$-Mn. At 1.9 GPa, the boundary of the ordered phases, we observe a sudden decrease of the residual resistivity and a peak of the A-coefficient of $$T^2$$-term of the resistivity.

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.

Journal Articles

Pressure effect on antiferromagnetic ordering in UIn$$_3$$

Haga, Yoshinori; Honda, Fuminori*; Eto, Tetsujiro*; Omi, Gendo*; Kagayama, Tomoko*; Takeshita, Nao*; Mori, Nobuo*; Nakanishi, Takeshi*; Tokiwa, Yoshifumi*; Aoki, Dai*; et al.

Journal of the Physical Society of Japan, 71(8), p.2019 - 2021, 2002/08

 Times Cited Count:9 Percentile:53.59(Physics, Multidisciplinary)

Pressure phase diagram of the antiferromagnet UIn3 was constructed from the electrical resistivity measurement under high pressures up to 9 GPa. Neel temperature increases monotonically with increasing pressure from 88 K at ambient pressure to 127 K at 9 GPa. We observed an additional resistive anomaly at 21 K under 1.4 GPa. This anomaly brings about an increase of the residual resistivity. The transition temperature decreases gradually with increasing pressure and disappears around 8 GPa.

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