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Title: Charge density waves induced superconductivity in LaSrCuO with intra-layer interactions
Authors: Varshney, Dinesh
Patel, G S
Singh, R K
Keywords: Charge density;Superconductivity;LaSrCuO
Issue Date: Jul-2003
Publisher: NISCAIR-CSIR, India
Abstract: An effective two-dimensional dynamic interaction is developed which incorporates screening of holes by charge density fluctuations and by optical phonons to discuss the nature of the pairing mechanism leading to superconductivity in layered La-based cuprates. The authors treat the La-Sr-CuO system as an ionic solid containing layers of holes as carriers and a model dielectric function is set up which fulfils the appropriate sum rules on the electronic and ionic polarizabilities. Estimate of the Coulomb pseudo-potential (μ*=0. 22), describing the screening effects on superconductivity is due to reduced carrier density and large value of the optical dielectric constant as well as the effective mass of holes. The hole-phonon coupling constant (λ) is evaluated as 1.5, which infers strong strength of coupling. Following strong coupling theory, the superconducting transition temperature of optimally doped La-Sr-CuO is estimated as 42 K. The isotope exponent, coherence length and magnetic penetration depth are also estimated. The implications of the model and its analysis are discussed.
Page(s): 542-555
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.41(07) [July 2003]

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