Abstract
Using band structure parameters extracted from photoemission data by Yoshida et al., Phys. Rev. B., 2006, we have analyzed the temperature dependence of the superfluid density in overdoped La2-xSrxCuO4. We point out that the temperature behavior 1/λab2 is very sensitive to the ratio 2?0/kBTc and have estimated this quantity, using experimental data obtained previously by Panagopoulos et al., Phys. Rev. B., 1999. We compare the results with those obtained from NMR / NQR (Nuclear Magnetic Resonance / Nuclear Quadrupole Resonance) (Mayer et al., J. Phys, Cond. Mat., 2007) and scanning tunneling spectros-copy (Kato et al., Physica C, 2007) data.
Highlights
Up to now there is no consensus about the nature of superconductivity in layered cuprates
In this context it is important to study the temperature dependencies of the superfluid density because this quantity is directly related to superconductivity
At the moment all this information is available for La2-xSrxCuO4 superconductor and in what follows we analyze the temperature dependence of superfluid density and compare the results with available experimental data by Panagopoulos [1]
Summary
Up to now there is no consensus about the nature of superconductivity in layered cuprates In this context it is important to study the temperature dependencies of the superfluid density because this quantity is directly related to superconductivity. Won and Maki [2] were first who pointed out that in case d-wave pairing the ratio 2Δ0/kBTc can be different from its standard BCS value 3.52. Their calculations were performed in week coupling approximation which in the strict sense is not appreciable for layered cuprates.
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