Superconductivity in the two-dimensional t-t′-Hubbard model

Andreas Eberlein; Walter Metzner

doi:10.1103/PhysRevB.89.035126

← Back to search

Superconductivity in the two-dimensional t-t′-Hubbard model

Andreas Eberlein, Walter Metzner

DOI 10.1103/PhysRevB.89.035126 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Using a recently developed renormalization group method for fermionic superfluids, we determine conditions for d-wave superconductivity in the ground state of the two-dimensional Hubbard model at moderate interaction strength, and we compute the pairing gap in the superconducting regime. A pairing instability signaled by a divergent flow in the Cooper channel leads to a superconducting state in all studied cases. The next-to-nearest-neighbor hopping t′ plays a crucial role in the competition between antiferromagnetism and superconductivity. A sizable t′ is necessary to obtain a sizable pairing gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown