Absence of superconductivity in hole-doped BaFe2−xCrxAs2 single crystals
Athena S. Sefat, David J. Singh, Lindsay H. VanBebber, Yurij Mozharivskyj, Michael A. McGuire, Rongying Jin, Brian C. Sales, Veerle Keppens, David Mandrus
DOI 10.1103/PhysRevB.79.224524 · Physical Review B
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Abstract
We investigate the physical properties and electronic structure upon Cr doping in the iron arsenide layers of BaFe2As2. This form of hole doping leads to suppression of the magnetic/structural phase transition in BaFe2−xCrxAs2 for x>0, but does not lead to superconductivity. For x≤0.75 values, temperature dependence of the resistivity, specific heat, magnetic susceptibility, Hall coefficient, and single-crystal x-ray diffraction data are presented. The resulting phase diagram is suggestive that superconductivity does not derive simply from the suppression of the structural/magnetic transitions. The materials show signatures of approaching a ferromagnetic state for x as little as 0.36 by an enhanced Wilson ratio. Such results reflect renormalization due to spin fluctuations and they are supported by density-functional supercell calculations for slightly higher doping level of x=1. Calculations show a strong interplay between magnetic ordering and chemical ordering of Fe and Cr, with a ferromagnetic ground state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xCrxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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