Unconventional Superconductivity, Spontaneous Time-Reversal Symmetry Breaking and Lowering of Kinetic Energy in Doped, Short-Range Antiferromagnets

• Authors: P. Wróbel , A. Maciąg , R. Eder , P. Fulde , R. Micnas
• Languages of publication: EN

Abstracts

EN

In this paper we focus on the anomalous temperature dependence of the in-plane conductivity and symmetry mixing of the superconducting order parameter observed in various experiments on cuprates. We show that the one-band Hubbard model is not capable of describing the physics of cuprates because the kinetic energy is lowered in this model in the superconducting state, which contradicts experimental observations. The proper model to investigate doped, short-range antiferromagnets is the t-J model, for which our results agree with experiments. We analyze a spin polaron model, that is an effective model for a doped antiferromagnet. In the framework of this model we also study the superconducting order-parameter symmetry-mixing phenomenon. We show that the expected mixing of d-wave symmetry with p-wave symmetry takes place in the superconducting order-parameter at a finite value of the doping parameter. This symmetry mixing brakes the time-reversal symmetry.

Keywords

EN

74.20.Mn; 71.10.Fd

Discipline

• 74.20.Mn: Nonconventional mechanisms
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 5
• Pages: 575-581

Dates

published

2004-11

received

2004-06-06

Contributors

author

P. Wróbel

• Institute for Low Temperature and Structure Research, P.O. Box 1410, 50-950 Wrocław 2, Poland
• Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany

author

A. Maciąg

• Institute for Low Temperature and Structure Research, P.O. Box 1410, 50-950 Wrocław 2, Poland

author

R. Eder

• Forschungszentrum Karlsruhe, IFP, P.O. Box 3640, 76021 Karlsruhe, Germany

author

P. Fulde

• Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany

author

R. Micnas

• Adam Mickiewicz University, Institute of Physics, Umultowska 85, 61-614 Poznań, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.106.575