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High-pressure magnetic properties and electrical transport behaviors of half-metallic ferromagnet CrO

Physical Chemistry Chemical Physics, ISSN: 1463-9076, Vol: 25, Issue: 10, Page: 7366-7372
2023
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Shandong Key Laboratory of Optical Communication Science and Technology Reports Findings in Science (High-pressure magnetic properties and electrical transport behaviors of half-metallic ferromagnet CrO2)

2023 MAR 15 (NewsRx) -- By a News Reporter-Staff News Editor at Physics Daily News -- New research on Science is the subject of a

Article Description

The magnetic properties and electrical transport behaviors of half-metallic ferromagnet chromium dioxide (CrO) powders under high pressure have been investigated by in situ electrical resistivity, magneto-resistivity, and Hall-effect measurements. Our results reveal that the Hall coefficient, carrier concentration, and mobility all present discontinuous changes from 11.7 GPa to 14.9 GPa which can be attributed to the second-order structural transition from the rutile-type to CaCl-type. However, the resistivity decreases monotonically from ambient pressure to 16.5 GPa. This is due to, first, the decreased carrier concentration and the increased carrier mobility canceling the effects of each other on the resistivity; second, according to the calculation results, the bandgap of CrO decreased gradually with the pressure, and the bandgaps of the rutile-type phase and the CaCl-type phase are extremely similar. CrO exhibits a linear and negative magnetoresistance under the applied magnetic field (0∼ ± 15 kOe). As the pressure increases, the magnetoresistance remains negative, but it becomes nonlinear and less symmetric, suggesting that pressure has an appreciable impact on the double-exchange mechanism leading to ferromagnetism in CrO

Bibliographic Details

Zhang, Guozhao; Cui, Shouxin; Zhang, Haiwa; Feng, Zhenbao; Wang, Guangyu; Wang, Qinglin; Li, Yinwei; Liu, Cailong

Royal Society of Chemistry (RSC)

Physics and Astronomy; Chemistry

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