t-t'-J-U Model in Mean-Field Approximation: Coexistence of Superconductivity and Antiferromagnetism

• Authors: M. Abram
• Languages of publication: EN

Abstracts

EN

We discuss the t-J-U model in the mean-field approximation. The role of spin-exchange coupling J and the second nearest hopping t' are examined in the context of the coexistence of superconductivity and antiferromagnetism. Stability of the phases is studied with respect to temperature. The coexistence region exists for the sufficiently large Coulomb repulsion (U>U_{cr}), and in the vicinity of the half-filled band (hole doping δ < δ_{cr}). The critical hole doping is relatively small (δ_{cr} ≈ 0.006 for J/|t| = 1/3) and linear with respect to J. The decrease of U_{cr} is proportional to J, except the limit of small J (J/|t| < 0.03), where U_{cr} grows rapidly with decreasing J. The effect of the second nearest hopping is limited - the phase diagram does not change in a qualitative manner when the t' value is changed. In the limit of T → 0, SC phase is stable even for large hole-doping (such as δ = 0.5). Additional paramagnetic phase appears for large δ or small U at non-zero temperature. When temperature increases, both SC and AF+SC phase regions are reduced.

Keywords

EN

71.27.+a; 74.25.Dw; 74.72.Gh

Discipline

• 74.72.Gh: Hole-doped
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 74.25.Dw: Superconductivity phase diagrams

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 4a
• Pages: A-25-A-30

Dates

published

2014-10

Contributors

author

M. Abram

• Marian Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

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Identifiers

DOI

10.12693/APhysPolA.126.A-25