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Type: Artigo de periódico
Title: Possible Unconventional Superconductivity In Substituted Bafe 2 As 2 Revealed By Magnetic Pair-breaking Studies
Author: Rosa P.F.S.
Adriano C.
Garitezi T.M.
Piva M.M.
Mydeen K.
Grant T.
Fisk Z.
Nicklas M.
Urbano R.R.
Fernandes R.M.
Pagliuso P.G.
Abstract: The possible existence of a sign-changing gap symmetry in BaFe 2 As 2 -derived superconductors (SC) has been an exciting topic of research in the last few years. To further investigate this subject we combine Electron Spin Resonance (ESR) and pressure-dependent transport measurements to investigate magnetic pair-breaking effects on BaFe 1.9 M 0.1 As 2 (M = Mn, Co, Cu, and Ni) single crystals. An ESR signal, indicative of the presence of localized magnetic moments, is observed only for M = Cu and Mn compounds, which display very low SC transition temperature (T c) and no SC, respectively. From the ESR analysis assuming the absence of bottleneck effects, the microscopic parameters are extracted to show that this reduction of T c cannot be accounted by the Abrikosov-Gorkov pair-breaking expression for a sign-preserving gap function. Our results reveal an unconventional spin- and pressure-dependent pair-breaking effect and impose strong constraints on the pairing symmetry of these materials.
Editor: Nature Publishing Group
Citation: Scientific Reports. Nature Publishing Group, v. 4, n. , p. - , 2014.
Rights: aberto
Identifier DOI: 10.1038/srep06252
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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