Z W Ouyang et al 2009 J. Phys.: Condens. Matter 21 016006 doi:10.1088/0953-8984/21/1/016006
Insulator–metal phase transition of Pr0.6Ca0.4MnO3 studied by x-ray absorption spectroscopy in pulsed magnetic fields
Z W Ouyang1, Y H Matsuda1,2, H Nojiri1, Y Inada3, Y Niwa3 and T Arima4
Show affiliationsEvolution 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.
- PACS
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71.30.+h Metal-insulator transitions and other electronic transitions
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
78.70.Dm X-ray absorption spectra
71.20.Ps Other inorganic compounds
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
- Subjects
- Dates
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Issue 1 (7 January 2009)
Received 22 September 2008, in final form 30 October 2008
Published 2 December 2008
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Insulator–metal phase transition of Pr0.6Ca0.4MnO3 studied by x-ray absorption spectroscopy in pulsed magnetic fields
Z W Ouyang et al 2009 J. Phys.: Condens. Matter 21 016006
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