Broad Peak in the dx2−y2 Superconducting Correlation Length as a Function of Hole Concentration in the Two-Dimensional t−J Model

W. O. Putikka; M. U. Luchini

doi:10.1103/PhysRevLett.96.247001

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Broad Peak in the dx2−y2 Superconducting Correlation Length as a Function of Hole Concentration in the Two-Dimensional t−J Model

W. O. Putikka, M. U. Luchini

DOI 10.1103/PhysRevLett.96.247001 · Physical Review Letters

T1

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Abstract

We have calculated high temperature series to 12th order in inverse temperature for singlet superconducting correlation functions of the 2D t−J model with s, dx2−y2, and dxy symmetry pairs. Our calculations differ from previous work by removing disconnected pieces from the original four-point correlator and by treating the resulting pairing correlator as a matrix. We find the correlation length for dx2−y2 pairing grows significantly with decreasing temperature and develops a broad peak as a function of doping around δ=0.25 for T/J=0.25 at J/t=0.4. The correlation lengths for s and dxy symmetry remain small and do not display peaks. Antiferromagnetic spin correlations at low doping act to suppress the dx2−yx and dxy superconducting correlation lengths.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown