Anomalous local magnetic field distribution and strong pinning in CaFe1. 94Co0. 06As2 single crystals (original) (raw)
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Arxiv preprint arXiv:1201.3693, 2012
Abstract: Imaging local magnetic field distribution in a single crystal of superconductor CaFe1. 94Co0. 06As2 shows the presence of anomalous remnant magnetization within Meissner like regions of the sample. Close to the superconducting transition temperature we find a coexistence of superconductivity and magnetic correlations. While the magnetic correlations are enhanced with the lowering of temperature, interestingly the area over which the magnetic phase exists shrinks at the expense of a growing superconducting ...