Superconducting Condensation Energy and Pseudogap Formation in La<sub>2-<i>x</i></sub>Sr<sub><i>x</i></sub>CuO<sub>4</sub>: New Energy scale for Superconductivity

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  • Momono Naoki
    Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
  • Matsuzaki Toshiaki
    Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
  • Oda Migaku
    Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
  • Ido Masayuki
    Department of Physics, Hokkaido University, Sapporo 060-0810, Japan

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  • Superconducting Condensation Energy and Pseudogap Formation in La2-xSrxCuO4: New Energy scale for Superconductivity.

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The electronic specific heat Cel was measured for La2-xSrxCuO4 to examine the superconducting condensation energy at T=0, U0. We reconfirmed that U0 is markedly reduced even in slightly underdoped samples whose Tc's are still more than 30 K. The reduction of U0 results from the suppression of the effective superconducting gap, in addition to that of the density of states at the Fermi level EF, caused by the pseudogap formation in the normal state. The doping-level ( p) dependence of U0 as well as Tc can be explained over a wide p range by introducing an effective energy gap Δeff=β pΔ0 (β=4.5) instead of Δ0, where Δ0 is the maximum gap at T<< Tc.

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