|
|||||
|
|
Structural and electrical transport properties of FeH x under high pressures and low temperatures |
|
| Authors: | Takahiro Matsuoka Naohisa Hirao Yasuo Ohishi Katsuya Shimizu Akihiko Machida Katsutoshi Aoki |
| Institution: | 1. Materials Science Division , Japan Synchrotron Radiation Research Institute (JASRI/SPring-8) , Koto 1-1-1, Sayo, Hyogo, 679-5198, Japan tmatsuoka@spring8.or.jp;3. Materials Science Division , Japan Synchrotron Radiation Research Institute (JASRI/SPring-8) , Koto 1-1-1, Sayo, Hyogo, 679-5198, Japan;4. KYOKUGEN, Center for Quantum Science and Technology under Extreme Conditions , Osaka University , Toyonaka, Osaka, 560-8531, Japan;5. Japan Atomic Energy Agency (JAEA) , Koto 1-1-1, Sayo, Hyogo, 679-5198, Japan |
| Abstract: | We present the first successful in situ simultaneous measurement of the electrical resistance and X-ray diffraction of FeH x (x～ 1) under high-pressure H2 up to 25.5 GPa and low temperatures down to 9 K. The electrical resistivity ρ showed a sharp increase with the formation of iron-hydride FeH x (x～ 1) at 3.5 GPa. The ?′-phase of FeH x was found to be metallic up to 25.5 GPa. The ρ vs. T curves up to 16.5 GPa approximately follow Fermi-liquid law below 25 K. However, T 5 was found to be better fitting at 25.5 GPa. This change can be considered to be related to the previously reported ferromagnetism collapse at corresponding pressure. |
| Keywords: | iron-hydride electrical resistance X-ray diffraction diamond anvil cell magnetism structural transition |