Influence of the Extra Layer on the Transport Properties of NdFeAsO1−0.14F0.14 and FeSe0.88 Superconductors from Magneto Dynamic Analysis

被引：0
作者：
D. Di Gioacchino
A. Marcelli
A. Puri
A. Iadecola
N. L. Saini
A. Bianconi
机构：
[1] Istituto Nazionale di Fisica Nucleare,Laboratori Nazionali di Frascati
[2] University of Science and Technology of China,Chinese Academy of Science
[3] Università degli Studi Roma Tre,Dipartimento di Scienze Geologiche
[4] Università degli Studi di Roma “La Sapienza”,Dipartimento di Fisica
来源：
Journal of Superconductivity and Novel Magnetism | 2012年 / 25卷
关键词：
NdFeAsO; F; FeSe; AC high harmonic susceptibility; Pinning; Superconductivity;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this letter, the electromagnetic response of the NdFeAsO1−0.14F0.14 (Tc=49 K) superconductor system, characterized by FeAs and NdO alternating layers, has been compared with that of FeSe0.88. We have studied the flux dynamics of these two systems by means of ac multi-harmonic magnetic susceptibility. The analysis shows that although characterized by larger thermal fluctuations due to its higher Tc, NdFeAsO1−0.14F0.14 exhibits a stronger pinning force relative to FeSe0.88. The further Irreversibility Line (IL) analysis also points out that both superconductors have a 3D flux pinning behavior. We associate the stronger pinning force in the NdFeAsO1−0.14F0.14 structure to the presence of the extra NdO layer. Different pinning contributions can be associated to the structural stress associated to FeAs superconducting layers and/or to the Nd3+ ions magnetic moment (μ∼3.6 μB) contribution on the flux cores. We will also show that these pinning are over imposed to a weak collective contribution due to the dopant F atoms.
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页码：1289 / 1292
页数：3
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