On Iachello's model of cuprate superconductors |
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| Authors: | Y Krivolapov A Mann J L Birman |
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| Institution: | 1. Department of Physics , Technion-Israel Institute of Technology , Haifa 32000, Israel evgkr@tx.technion.ac.il;3. Department of Physics , Technion-Israel Institute of Technology , Haifa 32000, Israel |
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| Abstract: | 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 type of boson, 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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