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Type: Artigo de periódico
Title: Pressure effects on magnetic pair-breaking in Mn- and Eu-substituted BaFe2As2
Author: Rosa, PFS
Garitezi, TM
Adriano, C
Grant, T
Fisk, Z
Urbano, RR
Fernandes, RM
Pagliuso, PG
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 (T-c) of BaFe2-xCoxAs2 samples slightly under the optimally doped region, indicating the presence of a pair-breaking effect. At low pressures, an increase of T-c is observed for all studied compounds followed by an expected decrease at higher pressures. However, in the Eu dilute system, T-c 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 T-c. (C) 2014 AIP Publishing LLC.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.4861577
Date Issue: 2014
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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