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Novel normal-state low field microwave absorption in SmFeAsO1−xFx iron pnictide superconductors
Solid State Communications ( IF 2.1 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.ssc.2019.113800
R.B. Onyancha , J. Shimoyama , Jayashree Das , H. Ogino , U.O. Aigbe , V.V. Srinivasu

Abstract We report on the systematic normal and superconducting states microwave absorption studies in polycrystalline samples of SmFeAsO 1 − x F x using an electron spin resonance (ESR) spectrometer. In the normal state, we observed two absorption spectra; at high fields (~3500 G) and low fields (around 0 G). The high field spectrum is in principle a resonance spectrum corresponding to a saturated state. It was observed that this signal broadens and its peak to peak intensity decreases on cooling the sample from room temperature. Ultimately, the signal becomes ESR ‘silent’ in the superconducting state. On the other hand, the low field microwave absorption (LFMA), centered around zero field, was observed for the first time, in a superconducting material. Based on the line-width, hysteresis and peak to peak signal intensity, we have shown that this spectrum is distinctively different from the already known LFMA signal that occurs in the superconducting state. These results present a system that shows LFMA spectrum in both normal and superconducting state thus providing an excellent platform to analyse the elusive LFMA phenomenon.

中文翻译:

SmFeAsO1−xFx 铁元素超导体中新型常态低场微波吸收

摘要 我们报告了使用电子自旋共振 (ESR) 光谱仪对 SmFeAsO 1 - x F x 多晶样品进行系统的正常和超导状态微波吸收研究。在正常状态下,我们观察到两个吸收光谱;在高场(~3500 G)和低场(约0 G)。高场谱原则上是对应于饱和状态的共振谱。观察到该信号在将样品从室温冷却时变宽并且其峰到峰强度降低。最终,信号在超导状态下变为 ESR“静音”。另一方面,首次在超导材料中观察到以零场为中心的低场微波吸收 (LFMA)。基于线宽、滞后和峰峰值信号强度,我们已经证明,该频谱与已知的超导状态下发生的 LFMA 信号截然不同。这些结果提供了一个系统,可以显示正常和超导状态下的 LFMA 光谱,从而为分析难以捉摸的 LFMA 现象提供了一个极好的平台。
更新日期:2020-02-01
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