Influence of the Extra Layer on the Transport Properties of NdFeAs1−0.14F0.14 and FeSe0.88 Superconductors from Magneto Dynamic Analysis. Di Gioacchino, D., Marcelli, A., Puri, A., Iadecola, A., Saini, N. L., & Bianconi, A. Journal of Superconductivity and Novel Magnetism, 2012. Paper doi abstract bibtex In this letter, the electromagnetic response of the NdFeAsO 1−0.14 F 0.14 ( T c =49 K) superconductor system, characterized by FeAs and NdO alternating layers, has been compared with that of FeSe 0.88 . 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 T c , NdFeAsO 1−0.14 F 0.14 exhibits a stronger pinning force relative to FeSe 0.88 . 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 NdFeAsO 1−0.14 F 0.14 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 Nd 3+ ions magnetic moment ( μ ∼3.6 μ B ) 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.
@article{di_gioacchino_influence_2012,
title = {Influence of the {Extra} {Layer} on the {Transport} {Properties} of {NdFeAs}1−0.14F0.14 and {FeSe}0.88 {Superconductors} from {Magneto} {Dynamic} {Analysis}},
issn = {1557-1939},
url = {http://dx.doi.org/10.1007/s10948-012-1596-z},
doi = {10.1007/s10948-012-1596-z},
abstract = {In this letter, the electromagnetic response of the NdFeAsO 1−0.14 F 0.14 ( T c =49 K) superconductor system, characterized by FeAs and NdO alternating layers, has been compared with that of FeSe 0.88 . 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 T c , NdFeAsO 1−0.14 F 0.14 exhibits a stronger pinning force relative to FeSe 0.88 . 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 NdFeAsO 1−0.14 F 0.14 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 Nd 3+ ions magnetic moment ( μ ∼3.6 μ B ) 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.},
journal = {Journal of Superconductivity and Novel Magnetism},
author = {Di Gioacchino, D. and Marcelli, A. and Puri, A. and Iadecola, A. and Saini, N. L. and Bianconi, A.},
year = {2012},
keywords = {fendas, fese, inhomogeneity, iron, super, transport},
pages = {1--4}
}
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