On a theoretical model for d-wave to mixed s- and d-wave transition in cuprate superconductors

Details On a theoretical model for d-wave to mixed s- and d-wave transition in cuprate superconductors On a theoretical model for d-wave to mixed s- and d-wave transition in cuprate superconductors

2006-01-16

arxiv.org/abs/cond-mat/0601341v2

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures

Scientific paper

A U(3) model proposed by Iachello for superconductivity in cuprate materials is analyzed. The model consists of s and d pairs (approximated as bosons) in a two-dimensional Fermi system with a surface. The transition occurs between a phase in which the system is a condensate of one of the bosons, and a phase which is a mixture of two types of bosons. In the current work we have investigated the validity of the Bogoliubov approximation, and we used a reduced Hamiltonian to determine a phase diagram, the symmetry of the phases and the temperature dependence of the heat capacity.

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