LDA+DMFT spectral functions and effective electron mass enhancement in the superconductor LaFePO

S. L. Skornyakov, N. A. Skorikov, A. V. Lukoyanov, A. O. Shorikov, V. I. Anisimov

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22 Citations (Scopus)

Abstract

In this paper we report LDA+DMFT results (method combining local-density approximation with dynamical mean-field theory) for spectral properties of superconductor LaFePO. Calculated k -resolved spectral functions reproduce recent angle-resolved photoemission spectroscopy data. Obtained effective electron mass enhancement values m/≈1.9-2.2 are in good agreement with infrared and optical studies, de Haas-van Alphen, electrical resistivity, and electronic specific-heat measurements results that unambiguously evidence for moderate correlations strength in LaFePO. Similar values of m /m were found in the other Fe-based superconductors with substantially different superconducting transition temperatures. Thus, the dynamical correlation effects are essential in the Fe-based superconductors, but the strength of electronic correlations does not determine the value of superconducting transition temperature.

Original languageEnglish
Article number174522
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number17
DOIs
Publication statusPublished - 21 May 2010
Externally publishedYes

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