期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 21, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/1/016006
关键词
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资金
- PRESTO of the Japan Science and Technology Agency
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) [451]
- Japan Society for the Promotion of Science
- Photon Factory Experimental Program [2007G073]
Evolution of the Mn K-edge x-ray absorption near edge structure (XANES) in Pr0.6Ca0.4MnO3 at pulsed magnetic fields has been investigated. A small enhancement of XANES spectra is detected across the magnetic-field-induced transition from the charge- and orbital-ordered (COO) insulator to ferromagnetic metal at 20 K. It is found that the magnetic-field dependence of the enhancement shows clear hysteresis, as seen in the magnetization with metamagnetic transition, suggesting a significant correlation between the change in the XANES and the field-induced collapse of the COO state. The enhancement of the absorption can be explained by an increase of the 4p density of states due to a reduction of hybridization between the 4p state of the central Mn ion with the core hole and the neighboring Mn 3d state. Local structural change around Mn ions is expected to modify the strength of the hybridization.
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