Spin fluctuations of d-wave superconductors

Kazumi Maki; H. Won

doi:10.1103/PhysRevLett.72.1758

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Spin fluctuations of d-wave superconductors

Kazumi Maki, H. Won

DOI 10.1103/PhysRevLett.72.1758 · Physical Review Letters

T1

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Abstract

The dynamic spin correlation function near the commensurate point Q=(π,π) in the superconducting state is calculated within mean field theory. We take the generalized t-J model as used by Tanamoto et al. For d-wave superconductor at T=0 K, we find that there will be no energy gap at incommensurate point, while the energy gap Eg=2μ develops at commensurate point in the particle-hole channel. On the other hand for s-wave superconductor a large energy gap develops irrespective of the nature of antiferromagnetic fluctuations. Therefore the d-wave model describes the neutron scattering data from both La1.86Sr0.14CuO4 by Mason et al. and YBa2Cu3O6+x by Rossat-Mignod et al. quite well, while the s-wave model is incompatible with these experimental results.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.86Sr0.14CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown
YBa2Cu3O6.92 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	unknown
YBa2Cu3O6.51 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	47	Pressure not reported	unknown