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Artículo

Normal state electronic properties of LaO1−xFxBiS2 superconductors

Querales Flores, Jose DanielIcon ; Ventura, Cecilia IleanaIcon ; Citro, R.; Rodríguez Núñez, J. J.
Fecha de publicación: 05/2016
Editorial: Elsevier Science
Revista: Physica B: Condensed Matter
ISSN: 0921-4526
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

A good description of the electronic structure of BiS2-based superconductors is essential to understand their phase diagram, normal state and superconducting properties. To describe the first reports of normal state electronic structure features from angle resolved photoemission spectroscopy (ARPES) in LaO1-xFxBiS2, we used a minimal microscopic model to study their low energy properties. It includes the two effective tight-binding bands proposed by Usui et al., Phys. Rev. B, 86, 2012, 220501(R), and we added moderate intra- A nd inter-orbital electron correlations related to Bi-(pY, pX) and S-(pY, pX) orbitals. We calculated the electron Green's functions using their equations of motion, which we decoupled in second-order of perturbations on the correlations. We determined the normal state spectral density function and total density of states for LaO1-xFxBiS2, focusing on the description of the k-dependence, effect of doping, and the prediction of the temperature dependence of spectral properties. Including moderate electron correlations, improves the description of the few experimental ARPES and soft X-ray photoemission data available for LaO1-xFxBiS2. Our analytical approximation enabled us to calculate the spectral density around the conduction band minimum at k→0=(0.45π,0.45π), and to predict the temperature dependence of the spectral properties at different BZ points, which might be verified by temperature-dependent ARPES.
Palabras clave: Bis2-Based Superconductors , Electron Correlations , Electronic Structure , Normal State Electronic Properties , Spectral Density Function
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/59954
DOI: https://dx.doi.org/10.1016/j.physb.2016.01.025
URL: https://www.sciencedirect.com/science/article/pii/S0921452616300254
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Querales Flores, Jose Daniel; Ventura, Cecilia Ileana; Citro, R.; Rodríguez Núñez, J. J.; Normal state electronic properties of LaO1−xFxBiS2 superconductors; Elsevier Science; Physica B: Condensed Matter; 488; 5-2016; 32-42
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