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Recently, Matsukawa et al. have discovered a new superconductorPr_2Ba_4Cu_7O_15-delta in which metallic CuO double chains are responsible forthe superconductivity. To investigate the superconductivity, we employ the d-pdouble chain model where the tight-binding parameters are determined so as tofit the LDA band structure. On the basis of the Tomonaga-Luttinger liquidtheory, we obtain the phase diagram including the superconducting phase in theweak coupling limit. We also calculate the Luttinger liquid parameter K_rho asa function of the electron density $n$ by using the Hartree-Fock approximation.With increasing $n$ from quarter filling, K_rho increases, and then exceeds 1/2when the superconducting correlation becomes most dominant. K_rho has a maximumat an optimal density between quarter- and half-filling. These results areconsistent with the experimental observation.Comment: 4 pages, 4 figure

journal of the physical society of japan

Superconductivity in the CuO Double Chain of Pr2Ba4Cu7O15-δon the Basis of Tomonaga–Luttinger Liquid Theory