Superconductivity and the spin-triplet collective mode in the t−J model close to antiferromagnetic instability

Damian Marinaro; Oleg Sushkov

doi:10.1103/PhysRevB.58.14934

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Superconductivity and the spin-triplet collective mode in the t−J model close to antiferromagnetic instability

Damian Marinaro, Oleg Sushkov

DOI 10.1103/PhysRevB.58.14934 · Physical Review B

T1

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Abstract

To investigate relations between long-range antiferromagnetic (AF) order, superconductivity and two-particle triplet collective excitations we consider a modified two dimensional t−J model at doping close to half filling. The model includes additional hopping J″ and nearest sites Coulomb repulsion V. The additional parameters allow us to control closeness of the system to the AF instability. We demonstrate the possibility of coexistence of long-range AF order and d−g-wave superconductivity. In the phase with long-range AF order we find, analytically, superconducting gaps and spin-wave renormalization. We demonstrate that at approaching the point of the AF instability the spin-triplet collective excitation arises with energy below the superconducting gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown