Open AccessANTIFERROMAGNETIC THEORETICAL CALCULATION FOR HlGH-Tc SUPERCONDUCTORS
Author(s) -
An Du,
Guozhu Wei,
Nie Hui-Quan
Publication year - 1992
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.1686
Subject(s) - antiferromagnetism , physics , superconductivity , condensed matter physics , hamiltonian (control theory) , magnetization , hubbard model , planar , specific heat , coupling (piping) , quantum mechanics , materials science , magnetic field , mathematical optimization , mathematics , computer graphics (images) , computer science , metallurgy
Considering layer-structural characteristico of high-Tc superconductors, the effective Hamiltonian is derived within linear spin wave approximation for aniso-tropic three-dimensional Hubbard model in the large U limit. The Sublattice magnetization, internal energy, Specific heat, parallel and perpindicular susceptibilies of the system are Calculated by using the equation of motion for matrix Green's function. It is shown that the ratio (δ=J⊥/J) of antiferromagnetic interplanar Coupling to planar coupling has an important effect upon these quantities. In the Low temperature regime T?2J(2+δ)/kB, a characteristic temperature T0=2J(2δ(2+δ))1/2/kB is given, the asympototic expressions of these quantities are respectively obtained for T?T0 and T?T0.