SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS

Dahm T, TEWORDT L, WERMBTER S (1994)
Journal of Low Temperature Physics 96(5-6): 275-294.

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Abstract
The conserving and self-consistent fluctuation-exchange approximation is used to calculate the quasi-particle self-energy and the dynamic spin susceptibility for the two-dimensional Hubbard model at band-fillings n somewhat below half-filling (n = 1). The spectral density of the spin susceptibility exhibits incommensurate peaks similar to those observed by neutron scattering in La2-xSrxCuO4. No spin-density-wave instability is found down to the lowest temperatures T (greater than or similar to 40 K) and up to the largest n (less than or similar to 0.85) and couplings U/t (less than or similar to 5) treated in this paper. For the same parameter space we calculate the eigenvalues of the superconducting eigen-solutions with d-wave and extended s-waves symmetry. These eigenvalues increase as T is decreased and n is increased, however, they are always far below unity which means that one is far from a superconducting transition. The calculated normal-state quantities are in qualitative agreement with the measured quantities of the cuprates, for example, the electrical resistivity is nearly a linear function of T like that of YBa2Cu3O7.
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Dahm T, TEWORDT L, WERMBTER S. SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS. Journal of Low Temperature Physics. 1994;96(5-6):275-294.
Dahm, T., TEWORDT, L., & WERMBTER, S. (1994). SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS. Journal of Low Temperature Physics, 96(5-6), 275-294.
Dahm, T., TEWORDT, L., and WERMBTER, S. (1994). SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS. Journal of Low Temperature Physics 96, 275-294.
Dahm, T., TEWORDT, L., & WERMBTER, S., 1994. SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS. Journal of Low Temperature Physics, 96(5-6), p 275-294.
T. Dahm, L. TEWORDT, and S. WERMBTER, “SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS”, Journal of Low Temperature Physics, vol. 96, 1994, pp. 275-294.
Dahm, T., TEWORDT, L., WERMBTER, S.: SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS. Journal of Low Temperature Physics. 96, 275-294 (1994).
Dahm, Thomas, TEWORDT, L, and WERMBTER, S. “SELF-CONSISTENT CALCULATION OF PHYSICAL QUANTITIES FOR THE 2-DIMENSIONAL HUBBARD-MODEL AND COMPARISON WITH CUPRATE HIGH-TC SUPERCONDUCTORS”. Journal of Low Temperature Physics 96.5-6 (1994): 275-294.
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