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Title: Bosonic versus fermionic pairs of topological spin defects in monolayered high-Tc superconductors
Author: García Bach, Ma. de los Ángeles
Keywords: Superconductivitat
Estructura electrònica
Propietats magnètiques
Materials magnètics
Electronic structure
Magnetic properties
Magnetic materials
Issue Date: 2005
Publisher: The American Physical Society
Abstract: The energy associated with bosonic and fermionic pairs of topological spin defects in doped antiferromagnetic quantum spin- 1 ∕ 2 square lattice is estimated within a resonating valence bond scenario, as described by a t − t ′ − J -like model Hamiltonian, plus a t ⊥ , responsible of a three-dimensional screening of the electrostatic repulsion within the bosonic pairs. For parameters appropriate for monolayered high- T c superconductors, both fermionic and bosonic pairs show x 2 − y 2 symmetry. We find a critical value of doping such that the energy of the bosonic pairs goes below twice the energy of two fermionic pairs at their Fermi level. This finding could be related to the onset of high- T c superconductivity.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2005, vol. 72, núm. 2, p. 024530-1-024530-9
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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