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Finite size effect on critical transition temperature of superconductive nanosolids

机译:有限尺寸对超导纳米固体临界转变温度的影响

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摘要

A simple and unified model is developed for finite size effect on the critical transition temperature of superconductive nanosolids, which is based on the size-dependent Debye temperature of crystals within the McMillan expression. In the model, two material and structure dependent parameters of Do and a are used, which, respectively, are the critical size at which all atoms of a low-dimensional material are located on its surface, and the ratio of the mean square vibrational amplitude between surface atoms and interior atoms, In light of this model, the critical transition temperatures of superconductive nanosolids can decrease or increase with the dropping size of nanosolids depending on the bond strength changes of interfacial atoms. The predicated results are consistent with the available experimental results for superconductors MgB2 and Nb thin films, Bi and ph granular thin films and nanoparticles, Al thin films and nanoparticles. (c) 2005 Elsevier Ltd. All rights reserved.
机译:建立了一个简单统一的模型,以对超导纳米固体的临界转变温度产生有限的尺寸影响,该模型基于McMillan表达式中晶体的尺寸相关的德拜温度。在模型中,使用了Do和a的两个与材料和结构有关的参数,分别是低维材料的所有原子位于其表面上的临界尺寸以及均方振动振幅的比根据表面模型,超导纳米固体的临界转变温度会随着界面尺寸的减小而增加或降低,这取决于界面原子的键合强度变化。预测结果与超导体MgB2和Nb薄膜,Bi和ph颗粒状薄膜和纳米粒子,Al薄膜和纳米粒子的可用实验结果一致。 (c)2005 Elsevier Ltd.保留所有权利。

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