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Kim, Jeehoon,Haberkorn, N.,Nazaretski, E.,Paula, R. de,Tan, Teng,Xi, X.X.,Tajima, T.,Movshovich, R.,Civale, L. Elsevier 2015 Solid state communications Vol.204 No.-
<P><B>Abstract</B></P> <P>We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB<SUB>2</SUB> thin film. The small magnetic penetration depth of <I>λ</I>=50±10nm at <I>T</I>=4K is related to a clean π-band. We find a high self-field critical current density <I>J</I> <SUB> <I>c</I> </SUB>, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate <I>S</I> (<I>T</I>) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.</P>
Kang, Hyon Chol,Yan, Hanfei,Chu, Yong S.,Lee, Su Yong,Kim, Jungdae,Nazaretski, Evgeny,Kim, Chan,Seo, Okkyun,Noh, Do Young,Macrander, Albert T.,Stephenson, G. Brian,Maser, Jö,rg The Royal Society of Chemistry 2013 Nanoscale Vol.5 No.16
<P>We report a study of the oxidation process of individual PtNi nanoparticles (NPs) conducted with a novel scanning multi-layer Laue lens X-ray microscope. The elemental maps reveal that alloyed PtNi NPs were transformed into Pt/NiO core-shell NPs by thermal oxidation. The observations furthermore indicate that a coalescence of Pt/NiO core-shell NPs occurred during oxidation.</P>