Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-24
Eur. Phys. J. B, vol : 21, 527-533 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages(tex file), 7 figures (ps files)
Scientific paper
10.1007/s100510170163
The competition between antiferromagnetism and the $d+id$ superconducting state is studied in a model with near and next near neighbour interactions in the absence of any on-site repulsion. A mean field study shows that it is possible to have simultaneous occurrence of an antiferromagnetic and a singlet $d+id$ superconducting state in this model. In addition, such a coexistence generates a triplet $d+id$ superconducting order parameter with centre of mass momentum $Q=(\pi, \pi)$ {\it dynamically} having the same orbital symmetry as the singlet superconductor. Inclusion of next nearest neighbour hopping in the band stabilises the $d_{xy}$ superconducting state away from half filling, the topology of the phase diagram, though, remains similar to the near neighbour model. In view of the very recent observation of a broad region of coexistence of antiferrmagnetic and unconventional superconducting states in organic superconductors, the possibility of observation of the triplet state has been outlined.
Beck Hans
Maitra Tulika
Taraphder A.
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