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Title: 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

Abstract

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.

Authors:
; ; ; ;  [1];  [2]; ;  [3];  [4]
  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)
Publication Date:
OSTI Identifier:
22591638
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 17; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Dwivedi, G. D., Chou, H., Yang, K. S., Jhong, D. J., Chan, W. L., Joshi, Amish G., Kumar, Shiv, Ghosh, A. K., and Chatterjee, Sandip. 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. United States: N. p., 2016. Web. doi:10.1063/1.4947466.
Dwivedi, G. D., Chou, H., Yang, K. S., Jhong, D. J., Chan, W. L., Joshi, Amish G., Kumar, Shiv, Ghosh, A. K., & Chatterjee, Sandip. 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. United States. doi:10.1063/1.4947466.
Dwivedi, G. D., Chou, H., Yang, K. S., Jhong, D. J., Chan, W. L., Joshi, Amish G., Kumar, Shiv, Ghosh, A. K., and Chatterjee, Sandip. Mon . "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". United States. doi:10.1063/1.4947466.
@article{osti_22591638,
title = {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},
author = {Dwivedi, G. D. and Chou, H. and Yang, K. S. and Jhong, D. J. and Chan, W. L. and Joshi, Amish G. and Kumar, Shiv and Ghosh, A. K. and Chatterjee, Sandip},
abstractNote = {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.},
doi = {10.1063/1.4947466},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 17,
volume = 108,
place = {United States},
year = {2016},
month = {4}
}