Electronic structure study of wide band gap magnetic semiconductor (La0.6Pr0.4)0.65Ca0.35MnO3 nanocrystals in paramagnetic and ferromagnetic phases

X-ray circular magnetic dichroism (XMCD), X-ray photoemission spectroscopy (XPS), and ultraviolet photoemission spectroscopy (UPS) techniques were used to study the electronic structure of nanocrystalline (La0.6Pr0.4)0.65Ca0.35MnO3 near Fermi-level. XMCD results indicate that Mn3+ and Mn4+ spins are...

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Bibliographic Details
Published in:Applied physics letters 2016-04, Vol.108 (17)
Main Authors: Dwivedi, G. D., Joshi, Amish G., Kumar, Shiv, Chou, H., Yang, K. S., Jhong, D. J., Chan, W. L., Ghosh, A. K., Chatterjee, Sandip
Format: Article
Language:English
Subjects:
Applied physics
Curie temperature
Dichroism
Electron states
Electronic structure
Electrons
Energy gap
Ferromagnetic phases
Ferromagnetism
Magnetic semiconductors
Nanocrystals
Photoelectric emission
Quantum theory
Spectrum analysis
Valence band
X ray photoelectron spectroscopy
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Summary:X-ray circular magnetic dichroism (XMCD), X-ray photoemission spectroscopy (XPS), and ultraviolet photoemission spectroscopy (UPS) techniques were used to study the electronic structure of nanocrystalline (La0.6Pr0.4)0.65Ca0.35MnO3 near Fermi-level. XMCD results indicate that Mn3+ and Mn4+ spins are aligned parallel to each other at 20 K. The low M-H hysteresis curve measured at 5 K confirms ferromagnetic ordering in the (La0.6Pr0.4)0.65Ca0.35MnO3 system. The low temperature valence band XPS indicates that coupling between Mn3d and O2p is enhanced and the electronic states near Fermi-level have been suppressed below TC. The valence band UPS also confirms the suppression of electronic states near Fermi-level below Curie temperature. UPS near Fermi-edge shows that the electronic states are almost absent below 0.5 eV (at 300 K) and 1 eV (at 115 K). This absence clearly demonstrates the existence of a wide band-gap in the system since, for hole-doped semiconductors, the Fermi-level resides just above the valence band maximum.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4947466