Abstract
We report a combined study of hydrostatic pressure (P ≤ 25 kbar) and chemical substitution on the magnetic pair-breaking effect in Eu- and Mn-substituted BaFe2As2 single crystals. At ambient pressure, both substitutions suppress the superconducting (SC) transition temperature (Tc) of BaFe2–xCoxAs2 samples slightly under the optimally doped region, indicating the presence of a pair-breaking effect. At low pressures, an increase of Tc is observed for all studied compounds followed by an expected decrease at higher pressures. However, in the Eu dilute system, Tc further increases at higher pressure along with a narrowing of the SC transition, suggesting that a pair-breaking mechanism reminiscent of the Eu Kondo single impurity regime is being suppressed by pressure. Furthermore, Electron Spin Resonance (ESR) measurements indicate the presence of Mn2+ and Eu2+ local moments and the microscopic parameters extracted from the ESR analysis reveal that the Abrikosov–Gor'kov expression for magnetic pair-breaking in a conventional sign-preserving superconducting state cannot describe the observed reduction of Tc.
Highlights
We report a combined study of hydrostatic pressure (P 25 kbar) and chemical substitution on the magnetic pair-breaking effect in Eu- and Mn-substituted BaFe2As2 single crystals
Electron Spin Resonance (ESR) measurements indicate the presence of Mn2þ and Eu2þ local moments and the microscopic parameters extracted from the ESR analysis reveal that the Abrikosov–Gor’kov expression for magnetic pair-breaking in a conventional sign-preserving superconducting state cannot describe the observed reduction of Tc
The semi-metal member BaFe2As2 (BFA) provides the possibility of growing high quality single crystals5 with a TSDW 1⁄4 139 K which can be suppressed toward SC by both chemical substitution and/or applied pressure
Summary
We report a combined study of hydrostatic pressure (P 25 kbar) and chemical substitution on the magnetic pair-breaking effect in Eu- and Mn-substituted BaFe2As2 single crystals. Pressure effects on magnetic pair-breaking in Mn- and Eu-substituted BaFe2As2
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