Bipolaronic superconductivity induced by bond phonons survives even in the presence of very strong long-ranged Coulomb repulsion leading to transition temperatures in line with values found in 3D materials at low densities, providing a robust way to obtain superconductivity in the low-density limit.

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Physica B Condensed Matter

S-wave superconductivity in the presence of a strong coulomb repulsion

Claudine Lacroix, C. Bastide, Acirete da Rosa Simões

Published Apr 1, 1990• 4 citations

Publisher

DOI: 10.1016/0921-4526(90)90144-j

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Dynamic cluster quantum Monte Carlo calculations for a doped two-dimensional extended Hubbard model are used to study the stability and dynamics of

d

-wave pairing when a nearest-neighbor Coulomb repulsion

V

is present in addition to the on-site Coulomb repulsion

U

. We find that

d

-wave pairing and the superconducting transition temperature

{T}_{c}

are only weakly suppressed as long as

V

does not exceed

U/2

. This stability is traced to the strongly retarded nature of pairing that allows the

d

-wave pairs to minimize the repulsive effect of

V

. When

V

approaches

U/2

, large momentum charge fluctuations are found to become important and to give rise to a more rapid suppression of

d

-wave pairing and

{T}_{c}

than for smaller

V