Abstract
We report on the non-resonant microwave absorption (NRMA) in a SmFeAsO0.88F0.12 polycrystalline sample measured at 9.45 GHz below T c (6.06−42 K). The NRMA line shape has a structure with, remarkably, two peaks, namely; a broad peak 1 and a narrow peak 2. The narrow peak 2 is a new feature in the NRMA line shape of iron pnictide superconductors, and it appears at both high (0−10000 G) and low field (−250 through 0 to +250 G) sweeps. We have observed that the structure and NRMA line shape evolves as a function of temperature and field modulation amplitude. Most importantly, we observed that this line shape evolution as a function of temperature does not show a crossover from ‘normal’ to ‘anomalous’ type of absorption.
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This work was supported by the Research Chair for Superconductivity Technology, University of South Africa. We acknowledge CSIR-South Africa for allowing us to use SEM.
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Onyancha, R.B., Shimoyama, J., Singh, S.J. et al. Observation of a Structure and Line Shape Evolution of Non-resonant Microwave Absorption in a SmFeAs(O, F) Polycrystalline Iron Pnictide Superconductor. J Supercond Nov Magn 28, 2927–2934 (2015). https://doi.org/10.1007/s10948-015-3106-6
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DOI: https://doi.org/10.1007/s10948-015-3106-6