Effects of doping on thermally excited quasiparticles in the high-Tc superconducting state
T. Xiang, C. Panagopoulos
Abstract
The physical properties of low energy superconducting quasiparticles in high- Tc superconductors are examined using magnetic penetration depth and specific heat experimental data. We find that the low energy density of states of quasiparticles of La2-xSrxCuO4 scales with (x-xc)/Tc to the leading order approximation, where xc is the critical doping concentration below which Tc=0. The linear temperature term of the superfluid density is renormalized by quasiparticle interactions and the renormalization factor times the Fermi velocity is found to be doping independent.
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