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Pressure effect on Hg-12(<i>n</i>− 1)<i>n</i>superconductors and Casimir effect in nanometer scale

M. T. D. OrlandoLETRAF-Phase Transition Studies Laboratory, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vit ória, 29075-910 ES, BrazilH. BelichCentro Internacional de Física da Matéria Condensada, Universidade de Brasília, Brasília, DF, BrazilLL AlvesLETRAF-Phase Transition Studies Laboratory, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vit ória, 29075-910 ES, BrazilJ. L. PassamaiLETRAF-Phase Transition Studies Laboratory, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vit ória, 29075-910 ES, BrazilJosé Maria PiresLETRAF-Phase Transition Studies Laboratory, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vit ória, 29075-910 ES, BrazilElton Márcio da Silva SantosLETRAF-Phase Transition Studies Laboratory, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vit ória, 29075-910 ES, BrazilV. A. RodriguesLETRAF-Phase Transition Studies Laboratory, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vit ória, 29075-910 ES, BrazilT. Costa-SoaresUniversidade Federal de Juiz de Fora (UFJF), Colégio Técnico Universitário, Av. Bernardo Mascarenhas, 1283, Bairro Fábrica, Juiz de Fora, MG 36080-001, Brazil

2008en

ABI

Annotatsiya

A description is presented for the Tc pressure-dependent behaviour of Hg-12(n − 1)n superconductors that takes into account the Casimir effect by considering the CuO2 conducting layers to act as plasma sheets. The Casimir energy arises from the parallel plasma sheets (Cu–O planes) whenever these are separated by distances on the nanometer scale. The Tc pressure dependence in Hg-12(n − 1)n superconductors can be described by a pressure-induced charge transfer together with intrinsic terms that are associated with the Casimir energy. For Hg-12(n − 1)n samples with optimum oxygen content, the charge transfer term vanishes, leaving an explicit expression for the intrinsic term. By picking up realistic parameters and inserting them in the expression for the Tc pressure dependence, we have a good agreement with experimental intrinsic term data observed in the mercury family Hg-12(n − 1)n superconductors.

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DOI: 10.1088/1751-8113/42/2/025502

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