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

G.D. Dwivedi | Zendy; Amish G. Joshi | Zendy; Shiv Kumar | Zendy; Hsiung Chou | Zendy; Kesong Yang | Zendy; Dai-Jhen Jhong | Zendy; Wen Ling Chan | Zendy; Anup K. Ghosh | Zendy; Sandip Chatterjee | Zendy

Open Access

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

Author(s) -

G.D. Dwivedi,

Amish G. Joshi,

Shiv Kumar,

Hsiung Chou,

Kesong Yang,

Dai-Jhen Jhong,

Wen Ling Chan,

Anup K. Ghosh,

Sandip Chatterjee

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4947466

Subject(s) - fermi level , condensed matter physics , photoemission spectroscopy , ferromagnetism , electronic structure , materials science , x ray photoelectron spectroscopy , paramagnetism , magnetic circular dichroism , quasi fermi level , band gap , magnetic semiconductor , inverse photoemission spectroscopy , curie temperature , angle resolved photoemission spectroscopy , magnetization , direct and indirect band gaps , nuclear magnetic resonance , physics , spectral line , magnetic field , electron , quantum mechanics , astronomy

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 vale...

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