Linear charge-density-wave instability in YBa2Cu3O7−δ and the pair-breaking effect from Coulomb scattering with superconducting electrons

P. Hertel; J. Appel; J. C. Swihart

doi:10.1103/PhysRevB.39.6708

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Linear charge-density-wave instability in YBa2Cu3O7−δ and the pair-breaking effect from Coulomb scattering with superconducting electrons

P. Hertel, J. Appel, J. C. Swihart

DOI 10.1103/PhysRevB.39.6708 · Physical Review B

T1

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Abstract

e-e scattering between charge carriers in the CuO2 planes and a one-dimensional electron system causes a temperature-dependent pair-breaking effect on the formation of a commensurate charge-density wave (CDW) in the one-dimensional system. The effect decreases exponentially when the planes become superconducting, allowing for the CDW instability to occur at or near the superconducting transition temperature TS. The CDW gap ratio 2ΔC0/kBTC depends on the e-e scattering rate Γ. The temperature dependence of the order parameter ΔC(T,Γ) is affected by superconductivity in the plane and, therefore, is different from the Bardeen-Cooper-Schrieffer (BCS) gap function. In order to distinguish between the BCS and CDW states, the nuclear-spin relaxation rates due to magnetic and quadrupole coupling, RC/RN and QC/QN, are found as functions of T. The frequency dependence of the infrared conductivity due to single-particle excitations across the CDW gap σ1C is evaluated as a function of Γ(T), yielding the Lee-Rice-Anderson result for T=0.

Source-reported materials — not catalogue approval

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