TY - JOUR
T1 - Insulator-metal phase transition of Pr0.6Ca 0.4MnO3 studied by x-ray absorption spectroscopy in pulsed magnetic fields
AU - Ouyang, Z. W.
AU - Matsuda, Y. H.
AU - Nojiri, H.
AU - Inada, Y.
AU - Niwa, Y.
AU - Arima, T.
PY - 2009/4/9
Y1 - 2009/4/9
N2 - 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 20K. 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.
AB - 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 20K. 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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U2 - 10.1088/0953-8984/21/1/016006
DO - 10.1088/0953-8984/21/1/016006
M3 - Article
C2 - 21817243
AN - SCOPUS:63749104339
VL - 21
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 1
M1 - 016006
ER -