2006/03/09 by Massimo Capone, M. Capone, Gabriel Kotliar +1 · 2 citations
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.74.054513
published as Phys. Rev. B 74, 054513 (2006) · 4 pages, 3 figures
arxiv created 2006/03/09 · openalex publication_date 2006/08/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the competition of antiferromagnetism and d-wave superconductivity at zero temperature in the two-dimensional Hubbard model using cellular dynamical mean-field theory for a 2\ifmmode×\else\texttimes\fi2 plaquette, and solve the associated cluster impurity model at zero temperature by means of exact diagonalization. The interplay between the two phases depends strongly on the strength of the correlation. At strong coupling (U\ensuremath\gtrsim8t) the two phases do not mix, and a first-order transition takes place as a function of doping between two pure phases. At weak coupling (U\ensuremath\lesssim8t) the two order parameters coexist within the same solution in a range of doping and the system smoothly evolves from the antiferromagnet to the superconductor. When the transition between the superconducting and the antiferromagetic phases is of the first-order, it is accompanied by a phase separation.