Influence of Electronic Structure on the Phase Diagram of Weakly Doped Superconducting Cuprates

• Authors: A. Maciąg , P. Wróbel
• Languages of publication: EN

Abstracts

EN

Motivated by the difference between the experimental phase diagram of cuprates and expectations of the t-J model, we analyze the influence of the electronic structure on superconducting state generation for small levels of doping. Following some theoretical studies of the Fermi surface for hole doped superconducting cuprates we base our calculations on the t-t'-t''-J model. We construct the spin polaron model, which is an effective model for the t-J model, and we expand it by adding the new terms related to the next neighbor hopping integrals t' and t''. In the framework of this model we study evolutions of superconducting correlation functions with doping. As a result of numerical calculations we find out that superconducting state vanishes for small levels of doping and finite values of t' and t''. This is in qualitative agreement with experimental results.

Keywords

EN

71.10.Fd; 74.20.Mn; 74.25.Dw

Discipline

• 74.20.Mn: Nonconventional mechanisms
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)
• 74.25.Dw: Superconductivity phase diagrams

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 111
• Issue: 5
• Pages: 721-725

Dates

published

2007-05

Contributors

author

A. Maciąg

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

author

P. Wróbel

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

References

• 1. S. Sorella, G.B. Martins, F. Becca, C. Gazza, L. Capriotti, A. Parola, E. Dagotto, Phys. Rev. Lett., 88, 117002, 02
• 2. P. Wróbel, R. Eder, R. Micnas, J. Phys., Condens. Matter, 15, 2775, 03
• 3. A. Damascelli, Z.X. Shen, Z. Hussain, Rep. Math. Phys., 75, 473, 03
• 4. T. Tohyama, S. Maekawa, Supercond. Sci. Techn., 13, R17, 00
• 5. K.A. Chao, J. Spalek, A.M. Oleś, Phys. Rev. B, 18, 3453, 87

Identifiers

DOI

10.12693/APhysPolA.111.721