Complex spectral evolution in a BCS superconductor, ZrB12

We investigate the electronic structure of a complex conventional superconductor, ZrB12 employing high resolution photoemission spectroscopy and ab initio band structure calculations. The experimental valence band spectra could be described reasonably well within the local density approximation. Ene...

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Bibliographic Details
Published in:Scientific reports 2013-11, Vol.3, p.3342
Main Authors: Thakur, Sangeeta, Biswas, Deepnarayan, Sahadev, Nishaina, Biswas, P K, Balakrishnan, G, Maiti, Kalobaran
Format: Article
Language:English
Subjects:
Electrons
Energy
Spectroscopy
Spectrum analysis
Temperature effects
Online Access:Get full text
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Summary:We investigate the electronic structure of a complex conventional superconductor, ZrB12 employing high resolution photoemission spectroscopy and ab initio band structure calculations. The experimental valence band spectra could be described reasonably well within the local density approximation. Energy bands close to the Fermi level possess t2g symmetry and the Fermi level is found to be in the proximity of quantum fluctuation regime. The spectral lineshape in the high resolution spectra is complex exhibiting signature of a deviation from Fermi liquid behavior. A dip at the Fermi level emerges above the superconducting transition temperature that gradually grows with the decrease in temperature. The spectral simulation of the dip and spectral lineshape based on a phenomenological self energy suggests finite electron pair lifetime and a pseudogap above the superconducting transition temperature.
ISSN:2045-2322
DOI:10.1038/srep03342