首页> 外文OA文献 >Nodeless superconductivity and the peak effect in the quasi-skutterudites $\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and $\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$
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Nodeless superconductivity and the peak effect in the quasi-skutterudites $\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and $\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$

机译:无节点超导电性和峰值效应   准skutterudites $ \ mathrm {Lu} _3 \ mathrm {Os} _4 \ mathrm {Ge} _ {13} $ and   $ \ mathrm {Y} _3 \ mathrm {}茹_4 \ mathrm {}戈_ {13} $

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摘要

We report an investigation of the superconducting states of$\mathrm{Lu}_3\mathrm{Os}_4\mathrm{Ge}_{13}$ and$\mathrm{Y}_3\mathrm{Ru}_4\mathrm{Ge}_{13}$ single crystals by measurements ofthe electrical resistivity, ac susceptibility and London penetration depth. Theanalysis of the penetration depth and the derived superfluid density indicatesthe presence of nodeless superconductivity and suggest that there are multiplesuperconducting gaps in both materials. Furthermore, ac susceptibilitymeasurements of both compounds display the peak effect in the low temperatureregion of the $H-T$ phase diagram. This anomalous increase of the criticalcurrent with field gives an indication of a change of the arrangement of fluxlines in the mixed state, as found in some of the isostructural stannidematerials.
机译:我们报告了对$ \ mathrm {Lu} _3 \ mathrm {Os} _4 \ mathrm {Ge} _ {13} $和$ \ mathrm {Y} _3 \ mathrm {Ru} _4 \ mathrm {Ge } _ {13} $单晶,通过测量电阻率,磁化率和伦敦穿透深度。穿透深度和推导的超流体密度的分析表明存在无节点超导性,并表明在两种材料中都存在多个超导间隙。此外,两种化合物的磁化率测量值在$ H-T $相图的低温区域均显示出峰值效应。临界电流随磁场的这种异常增加表明在混合状态下磁通线的布置发生了变化,这在某些等结构的锡化物材料中已经发现。

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