期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 34, 期 13, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac484e
关键词
extended Hubbard models; superlight fermion pairs; superconductivity; Bose-Einstein condensation; face-centred cubic lattice; unconventional superconductivity; UV model
This study demonstrates that paired fermions in face-centred-cubic (FCC) lattices, within extended Hubbard models with strong Coulomb repulsion, have different properties compared to pairs in other three-dimensional cubic lattices. The results show that strongly bound, light, and small pairs can be generated in FCC lattices across a wide parameter space.
The majority of fulleride superconductors with unusually high transition-temperature to kinetic-energy ratios have a face-centred-cubic (FCC) structure. We demonstrate that, within extended Hubbard models with strong Coulomb repulsion, paired fermions in FCC lattices have qualitatively different properties than pairs in other three-dimensional cubic lattices. Our results show that strongly bound, light, and small pairs can be generated in FCC lattices across a wide range of the parameter space. We estimate that such pairs can Bose condense at high temperatures even if the lattice constant is large (as in the fullerides).
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