Effect of pressure on the structural phase transition and superconductivity in (Ba1−xKx)Fe2As2 (x=0 and 0.45) and SrFe2As2 single crystals
M. S. Torikachvili, S. L. Bud’ko, N. Ni, P. C. Canfield
DOI 10.1103/PhysRevB.78.104527 · Physical Review B
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Abstract
The effects of pressure up to ∼20 kbar on the structural phase transition of SrFe2As2 and lightly Sn-doped BaFe2As2 as well as on the superconducting transition temperature and upper critical field of (Ba0.55K0.45)Fe2As2 single crystals have been studied. All the transition temperatures decrease with pressure in an almost linear fashion. Under pressure, the upper critical-field curve Hc2(T) for (Ba0.55K0.45)Fe2As2 shifts down in temperature to follow the zero-field Tc with very little change in slope. Composite P−T phase diagrams for three parent compounds AFe2As2 (A=Ba,Sr,Ca) are constructed and appear to be remarkably similar: (i) having a structural (antiferromagnetic) phase-transition line with a negative slope and (ii) showing signs of the emerging superconducting state at intermediate pressures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ba0.55K0.45)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure unresolved | onset |
| CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | 0.23 GPa | unknown |
| LaFeAs(O1-xFx) 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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