Strong correlations and the search for high-Tc superconductivity in chromium pnictides and chalcogenides

Abstract

Undoped iron superconductors accommodate $n=6$ electrons in five d-orbitals. Experimental and theoretical evidence shows that the strength of correlations increases with hole-doping, as the electronic filling approaches half-filling with $n=5$ electrons. This evidence delineates a scenario in which the parent compound of iron superconductors is the half-filled system, in analogy to cuprate superconductors. In cuprates the superconductivity can be induced upon electron or hole doping. In this work we propose to search for high-Tc superconductivity and strong correlations in chromium pnictides and chalcogenides with $n<5$ electrons. By means of ab-initio, slave spin and multi-orbital RPA calculations we analyse the strength of the correlations and the superconducting and magnetic instabilities in these systems with main focus on LaCrAsO. We find that electron-doped LaCrAsO is a strongly correlated system with competing magnetic interactions, being $(\pi ,\pi )$ antiferromagnetism and nodal d-wave pairing the most plausible magnetic and superconducting instabilities, respectively.

arXiv comment5 pages, 5 figures + supplementary information: 3 pages, 3 figures

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Cited by in corpus (16)

• Role of the orbital degree of freedom in iron-based superconductors
• Antiferromagnetic structure and electronic properties of BaCr2As2 and BaCrFeAs2
• First principles study of structural, magnetic and electronic properties of CrAs
• Cooperative Effects of Strain and Electron Correlation in Epitaxial VO2 and NbO2
• Observation of a remarkable reduction of correlation effects in BaCr2As2 by ARPES
• Strong electronic correlations and Fermi surface reconstruction in the quasi-one dimensional iron superconductor BaFe2S3
• Is BaCr${}_2$As${}_2$ symmetrical to BaFe${}_2$As${}_2$ with respect to half $3d$ shell filling?
• Possible Superconductivity in Electron-doped Chromium Pnictide LaOCrAs
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• Two-orbital Hubbard model vs spin $S=1$ Heisenberg model: studies on clusters
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• PhD Thesis: Electronic correlations in multiorbital systems
• Doping-dependent orbital magnetism in Chromium pnictides