Effects of doping on thermally excited quasiparticles in the high-$T_c$ superconducting state

Details Effects of doping on thermally excited quasiparticles in the high-$T_c$ superconducting state Effects of doping on thermally excited quasiparticles in the high-$T_c$ superconducting state

1999-10-07

arxiv.org/abs/cond-mat/9910098v2

Physical Review B Vol 61, 6343 (2000)

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures, minor change to the content, fig1 is reploted, to appear in Phys Rev B

Scientific paper

10.1103/PhysRevB.61.6343

The physical properties of low energy superconducting quasiparticles in high- $T_c$ superconductors are examined using magnetic penetration depth and specific heat experimental data. We find that the low energy density of states of quasiparticles of La$_{2-x}$Sr$_x$CuO$_4$ scales with $(x-x_c)/T_c$ to the leading order approximation, where $x_c $ is the critical doping concentration below which $T_c=0$. 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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