Slave Boson Approach to Neutron Scattering in YBa2Cu3O6+y Superconductors

Jan Brinckmann; Patrick A. Lee

doi:10.1103/PhysRevLett.82.2915

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Slave Boson Approach to Neutron Scattering in YBa2Cu3O6+y Superconductors

Jan Brinckmann, Patrick A. Lee

DOI 10.1103/PhysRevLett.82.2915 · Physical Review Letters

T1

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Abstract

The evolution of the so-called “41 meV resonance” in the magnetic response of YBCO cuprates is studied with slave boson theory for the t−t′−J model. The resonance appears as a collective spin fluctuation in the d-wave superconducting (SC) state. It is undamped at optimal doping due to a threshold in the excitation energies of particle-hole pairs with relative wave vector (π,π). When hole filling is reduced, the resonance moves to lower energies and broadens. Below the resonance energy we find a crossover to an incommensurate response in agreement with a recent experiment on YBa2Cu3O6.6. We show that dynamic nesting in the d-wave SC state causes this effect.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown