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Your search keyword '"Pedro Baptista de Castro"' showing total 2 results
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2 results on '"Pedro Baptista de Castro"'

1. Pressure-induced superconductivity in SnSb2Te4

Author

Peng Song, Ryo Matsumoto, Pedro Baptista de Castro, Yoshihiko Takano, Shintaro Adachi, Hiroshi Hara, Yoshito Saito, Hiroyuki Takeya, and Zhufeng Hou

Subjects
Superconductivity, Condensed Matter - Materials Science, Materials science, Condensed matter physics, Transition temperature, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, 02 engineering and technology, Diamond electrodes, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Phase-change material, Diamond anvil cell, Phase change, 0103 physical sciences, General Materials Science, 010306 general physics, 0210 nano-technology
Abstract

Here we firstly report the pressure-induced superconductivity in phase change materials SnSb2Te4. Single crystals of SnSb2Te4 were grown using a conventional melting-down method. The resistance under pressure was measured using an originally designed diamond anvil cell with boron-doped diamond electrodes. The temperature dependence of the resistance under different pressures has been measured up to 32.6 GPa. The superconducting transition of SnSb2Te4 appeared at 2.1 K ([Formula: see text]) under 8.1 GPa, which was further increased with applied pressure to a maximum onset transition temperature 7.4 K under 32.6 GPa.

Published
2020
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2. Magnetic entropy change of ErAl2 magnetocaloric wires fabricated by a powder-in-tube method.

Author

Takafumi D Yamamoto, Hiroyuki Takeya, Suguru Iwasaki, Kensei Terashima, Pedro Baptista de Castro, Takenori Numazawa, and Yoshihiko Takano

Subjects
MAGNETIC entropy, MAGNETOCALORIC effects, MECHANICAL behavior of materials, MAGNETIC properties, MAGNETIZATION measurement, WIRE, TRANSITION temperature
Abstract

We report the fabrication of ErAl2 magnetocaloric wires by a powder-in-tube (PIT) method and the evaluation of magnetic entropy change through magnetization measurements. The magnetic entropy change of ErAl2 PIT wires exhibits similar behavior to the bulk counterpart, while its magnitude is reduced by the decrease in the volume fraction of ErAl2 due to the surrounding non-magnetic sheaths. We find that another effect reduces the magnetic entropy change of the ErAl2 PIT wires around a ferromagnetic transition temperature, and discuss its possible origin in terms of a correlation between magnetic properties of ErAl2 and mechanical properties of sheath material. [ABSTRACT FROM AUTHOR]

Published
2020
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