Mishra, P. and Lohani, H. and Zargar, R. A. and Awana, V. P. S. and Sekhar, B. R. (2014) Photoemission studies of the near E-F spectral weight shifts in FeSe1-xTex superconductor. Journal of Physics: Condensed Matter, 26 (42). 425501-1-425501-6. ISSN 0953-8984

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Abstract

Our valence band photoelectron spectroscopic studies show a temperature dependent spectral weight transfer near the Fermi level in the Fe-based superconductor FeSe1-xTex. Using theoretical band structure calculations we have shown that the weight transfer is due to the temperature induced changes in the Fe(Se, Te)(4) tetrahedra. These structural changes lead to shifts in the electron occupancy from the xz/yz and x(2) - y(2) orbitals to the 3z(2) - r(2) orbitals indicating a temperature induced crossover from a metallic state to an Orbital Selective Mott (OSM) Phase. Our study presents an observation of a temperature induced crossover to a low temperature OSM phase in the family of Fe chalcogenides.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S IOP Publishing.
Uncontrolled Keywords:	UV photoemission spectroscopy, superconductor, electronic structure, pseudogap regime
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	03 Nov 2015 05:45
Last Modified:	03 Nov 2015 05:45
URI:	http://npl.csircentral.net/id/eprint/1462

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