Discriminating Lattice Structural Effects from Electronic Contributions to the Superconductivity of Doped MgB2 with Nanotechnology

Li, Sean, White, Tim, Sun, Chang Qing, Fu, Yong Qing, Plevert, Jacques and Lauren, K. (2004) Discriminating Lattice Structural Effects from Electronic Contributions to the Superconductivity of Doped MgB2 with Nanotechnology. The Journal of Physical Chemistry B, 108 (42). pp. 16415-16419. ISSN 1520-6106

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Official URL: http://dx.doi.org/10.1021/jp047902x

Abstract

Most partial altervalent/aliovalent substitutions for Mg or B in MgB2 studied to date depress the superconducting transition temperature (Tc) and, at higher replacements, completely suppress superconductivity of MgB2. The diminution and loss of superconductivity in MgB2 arise from the subtle interplay between the competing/cooperating effects of the electronic and lattice structural variations, which are induced by the different charge and atomic radii of the substituents. Here, we experimentally discriminate lattice structural effects from electronic contributions to superconductivity by exploiting the nanosize dependence of the lattice structure to modify structural parameters without resorting to chemical doping. It is found that the superconductivity of MgB2 is extremely sensitive to lattice parameter variation, such that contraction of Mg−Mg bond dramatically depresses Tc and eventually results in the loss of superconductivity as the average coordination of Mg to B falls from 12 to 8 due to the introduction of B vacancies for nanocrystalline MgB2 of 2.5 nm diameter.

Item Type: Article
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 26 Mar 2015 15:06
Last Modified: 15 Mar 2016 15:06
URI: http://nrl.northumbria.ac.uk/id/eprint/21828

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