Journal
PHYSICAL REVIEW B
Volume 95, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.075115
Keywords
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Funding
- Ministerio de Economia, Industria y Competitividad (Spain) [FIS2012-33521, FIS2014-53218-P, FIS2015-64654-P, MAT2015-66888-C3-1-R]
- Fundacion Ramon Areces
- National Natural Science Foundation of China [11374186, 51231007]
- China Scholarship Council
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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-T-c superconductivity and strong correlations in chromium pnictides and chalcogenides with n < 5 electrons. By means of ab initio slave-spin and multiorbital random-phase-approximation calculations we analyze the strength of the correlations and the superconducting and magnetic instabilities in these systems with the main focus on LaCrAsO. We find that electron-doped LaCrAsO is a strongly correlated system with competing magnetic interactions, with (pi, pi) antiferromagnetism and nodal d-wave pairing being the most plausible magnetic and superconducting instabilities, respectively.
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