Electronic structure study of wide band gap magnetic semiconductor (La{sub 0.6}Pr{sub 0.4}){sub 0.65}Ca{sub 0.35}MnO{sub 3} nanocrystals in paramagnetic and ferromagnetic phases

Journal Article · Mon Apr 25 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4947466· OSTI ID:22591638

Dwivedi, G. D.; Chou, H.; Yang, K. S.; Jhong, D. J.; Chan, W. L. ^[1]; Joshi, Amish G. ^[2]; Kumar, Shiv; Ghosh, A. K. ^[3]; Chatterjee, Sandip ^[4]

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1. Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan (China)
2. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110012 (India)
3. Department of Physics, Banaras Hindu University, Varanasi 221005 (India)
4. Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005 (India)

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 (La{sub 0.6}Pr{sub 0.4}){sub 0.65}Ca{sub 0.35}MnO{sub 3} near Fermi-level. XMCD results indicate that Mn{sup 3+} and Mn{sup 4+} 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 (La{sub 0.6}Pr{sub 0.4}){sub 0.65}Ca{sub 0.35}MnO{sub 3} 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 T{sub C}. 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.

• OSTI ID: 22591638
• Journal Information: Applied Physics Letters, Vol. 108, Issue 17; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRYSTALS
CURIE POINT
DOPED MATERIALS
ELECTRONIC STRUCTURE
FERMI LEVEL
HOLES
HYSTERESIS
MAGNETIC CIRCULAR DICHROISM
MAGNETIC SEMICONDUCTORS
MANGANESE IONS
NANOSTRUCTURES
PARAMAGNETISM
PHOTOEMISSION
VALENCE
X RADIATION
X-RAY PHOTOELECTRON SPECTROSCOPY