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arXiv 1002.1029cond-mat.supr-con
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由ESR揭示的T_c以上的涡激

Vortex excitations above T_c as revealed by ESR

Yu. Talanov, L. Salakhutdinov, E. Giannini, R. Khasanov

摘要:

利用电子自旋共振(ESR)技术,我们获得了数据,证明在临界温度以上的高温超导体中存在磁涡旋$T_c$。用表面自旋装饰方法研究了$T_c$以上的\bis单晶的磁激发。二苯基苦肼的表面层被用作磁场畸变的敏感探针。ESR信号参数的温度依赖性表明,远高于$T_c$,样品的磁通量受超导序参量波动的影响,而接近$T_c$,其变化是由于涡旋型激发。

英文摘要:

Using electron spin resonance (ESR) technique we have obtained data evidencing the existence of magnetic vortices in high-temperature superconductors at temperatures above the critical one $T_c$. We have studied magnetic excitations in \bis single crystals above $T_c$ with the method of surface spin decoration. The surface layer of diphenyl-picrylhydrazyl was used as a sensitive probe of magnetic field distortions. The temperature dependence of the ESR signal parameters has indicated that far above $T_c$ the magnetic flux of a sample is affected by the superconducting order parameter fluctuations while close to $T_c$ its changes are due to vortex-type excitations.

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