Incommensurate charge and spin fluctuations in d-wave superconductors

Hae-Young Kee; Yong Baek Kim

doi:10.1103/PhysRevB.59.4470

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Incommensurate charge and spin fluctuations in d-wave superconductors

Hae-Young Kee, Yong Baek Kim

DOI 10.1103/PhysRevB.59.4470 · Physical Review B

T1

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Abstract

We show analytic results for the irreducible charge and spin susceptibilities χ0(ω,Q), where Q is the momentum transfer between the nodes in d-wave superconductors. Using BCS theory and a circular Fermi surface, we find that the singular behavior of the irreducible charge susceptibility leads to the dynamic incommensurate charge collective modes. The peaks in the charge structure factor occur at a set of wave vectors which form an ellipse around Qd=(2kF,2kF) and Q0=(0,0) in momentum space with momentum-dependent spectral weight. It is also found that, due to the nonsingular irreducible spin susceptibility, an extremely strong interaction via random phase approximation is required to support the magnetic peaks near Qd.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.6-xNd0.4SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown