Physics – Condensed Matter – Superconductivity
Scientific paper
2000-11-09
Phys. Rev. B64, 054509 (2001)
Physics
Condensed Matter
Superconductivity
9 pages in PS format, 7 figures (included in PS), 1 table
Scientific paper
10.1103/PhysRevB.64.054509
We present a novel and convenient mean-field method, and apply it to study the metallic/antiferromagnetic interface of k-(BEDT-TTF)_2Cu[N(CN)]_2 Y organic superconductors (BEDT_TTF is bis-ethylen-dithio-tetrathiafulvalene, Y=Cl, Br). The method, which fully exploits the crystal symmetry, allows one to obtain the mean-field solution of the 2D Hubbard model for very large lattices, up to 6x10^5 sites, yielding a reliable description of the phase boundary in a wide region of the parameter space. The metal/antiferromagnet transtion appears to be second order, except for a narrow region of the parameter space, where the transition is very sharp and possibly first order. The cohexistence of metallic and antiferromagnetic properties is only observed for the transient state in the case of smooth second order transitions. The relevance of the present resaults to the complex experimental behavior of centrosymmetric k-phase BEDT-TTF salts is discussed.
Fortunelli Alessandro
Girlando Alberto
Painelli Anna
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