1998/07/02 by Charles Buhler, C. R. Buhler, Adriana Moreo · 6 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Angle-resolved photoemission spectroscopy #Brillouin zone #Charge (physics) #Condensed matter physics #Electronic structure #Hubbard model #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.59.9882
published in Physical review. B, Condensed matter 59(15), 9882-9887 (American Physical Society) · 6 pages revtex with 3 figures embedded
arxiv created 1998/07/02 · openalex publication_date 1999/04/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
As additional neutron scattering experiments are performed on a variety of high temperature superconducting compounds it appears that magnetic incommensuration is a phenomenon common to all of the samples studied. The newest experimental results indicate that incommensurate peaks exist at momentum q=\ensuremathπ(1,1\ifmmode±\else\textpm\fi\ensuremathδ) and \ensuremathπ(1\ifmmode±\else\textpm\fi\ensuremathδ,1) in La_2\ensuremath-xSrxCuO4 (LSCO) and YBa2Cu3O_7\ensuremath-\ensuremathδ (YBCO). The dependence of \ensuremathδ with hole doping appears to be similar in both materials. In addition, new angle-resolved photoemission spectroscopy (ARPES) data for LSCO as a function of doping show that its Fermi surface is qualitatively similar to the one of YBCO, contrary to what was previously believed. Early theoretical attempts to explain the behavior of LSCO and YBCO usually relied on one- or three-band Hubbard models or the t\ensuremath-J model with electron hopping beyond nearest neighbor and with different parameter values for each material. In this paper it is shown that using a one-band Hubbard U\ensuremath-t\ensuremath-t^\ensuremath' model with U/t=6 and t^\ensuremath'/t\ensuremath≈\ensuremath-0.25, good agreement is obtained between computational calculations and both neutron scattering and ARPES experiments for LSCO and YBCO. It is also shown that using a more negative t^\ensuremath'/t will induce short-range magnetic incommensuration along the diagonal direction in the Brillouin zone, in qualitative disagreement with the experimental results. At the finite temperatures of the present Monte Carlo simulation it is also observed that in this model the tendency to incommensuration appears to be more related to the shape of the two-dimensional Fermi surface and the strength of the interaction, rather than to charge order.