Unitary-transformed Fermions Theory of Iron-based Superconductors
Autor: | Kazuhisa Nishi |
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Rok vydání: | 2016 |
Předmět: |
Physics
Superconductivity Condensed matter physics Fermion Unitary transformation High Tc superconductivity d-p model Physics and Astronomy(all) 010402 general chemistry 01 natural sciences 0104 chemical sciences symbols.namesake Atomic orbital Mean field theory Iron-based superconductors Quantum mechanics Condensed Matter::Superconductivity 0103 physical sciences Composite fermion symbols 010306 general physics Wave function Hamiltonian (quantum mechanics) |
Zdroj: | Physics Procedia. 81:17-20 |
ISSN: | 1875-3892 |
DOI: | 10.1016/j.phpro.2016.04.008 |
Popis: | Unitary-transformed theory of iron-based superconductors is presented. This theory is based on the d-p model emphasizing that the electronic state of superconductors can be described by the composed fermions constructed with newly defined operators. The Hamiltonian is so modified by the unitary transformation using these fermion operators as to apply the mean field approximation. The theory is extended to the case of superconducting pnictides in considering some characteristics such as multi orbitals, antiferromagnetic metal and so on. It is indicated that the effective interaction between these composite fermions can determine the several electronic properties in superconducting pnictides. It is found that the superconductive paring wavefunction is s -like state different from the d state of cuprates, but can be changeable depending on the various conditions of the electronic or crystal structures. The relations with structural modification and carrier doping are also discussed. |
Databáze: | OpenAIRE |
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