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  Possible unconventional superconductivity in substituted BaFe2As2 revealed by magnetic pair-breaking studies

Rosa, P. F. S., Adriano, C., Garitezi, T. M., Piva, M. M., Mydeen, K., Grant, T., et al. (2014). Possible unconventional superconductivity in substituted BaFe2As2 revealed by magnetic pair-breaking studies. Scientific Reports, 4: 6252, pp. 1-6. doi:10.1038/srep06252.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F1CA-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F204-5
Genre: Journal Article

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 Creators:
Rosa, P. F. S.1, Author
Adriano, C.1, Author
Garitezi, T. M.1, Author
Piva, M. M.1, Author
Mydeen, K.2, Author              
Grant, T.1, Author
Fisk, Z.1, Author
Nicklas, M.3, Author              
Urbano, R. R.1, Author
Fernandes, R. M.1, Author
Pagliuso, P. G.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
3Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              

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 Abstract: The possible existence of a sign-changing gap symmetry in BaFe2As2-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 BaFe1.9M0.1As2 (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.

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 Dates: 20142014-09-01
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000341441400014
DOI: 10.1038/srep06252
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 4 Sequence Number: 6252 Start / End Page: 1 - 6 Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322