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Journal Article

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

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Mydeen,  K.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nicklas,  M.
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0023-F1CA-F
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.