37 research outputs found
Proximity effects near the interface between d-wave superconductors and ferro/antiferromagnets
We study the proximity effects near the interface between a d-wave
superconductor (S) and a ferromagnet (F) or an antiferromagnet (AF). The S-side
(F and AF-side) is described by the attractive (repulsive) Hubbard model, and
the Bogoliubov de Gennes equation derived within the Hartree-Fock approximation
is solved numerically. The superconducting order parameter and the
magnetization (m) can coexist near the interface, and the spatial variation of
m induces the spin-triplet p-wave component in both F and AF cases. The local
density of states is also calculated and discussed.Comment: 4 pages, 7 ps figures, to appear in J.Phys.Soc.Jpn. Vol.68, No.1
Phase Separation Induced by Density-Dependent Hopping Terms
We study phase separation in the model in which the constraint of no
double occupancy due to strong electron correlations leads to effective
narrowing of the band width. Using a mean-field approximation, we calculate the
compressibility in the normal state and show that the phase separation can be
induced by the variation of the band width.Comment: 6 pages, 3 figure