Quasiparticle Density of States of Clean and Dirty d-Wave Superconductors. Mixed-State Specific Heat of La2-xSrxCuO4 Single Crystals.

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  • Nohara Minoru
    Department of Advanced Materials Science, University of Tokyo, 7–3–1 Hongo, Tokyo 113–0033 CREST, Japan Science and Technology Corporation (JST)
  • Suzuki Hiroaki
    Department of Advanced Materials Science, University of Tokyo, 7–3–1 Hongo, Tokyo 113–0033
  • Isshiki Masanobu
    Department of Advanced Materials Science, University of Tokyo, 7–3–1 Hongo, Tokyo 113–0033
  • Mangkorntong Nikorn
    Department of Advanced Materials Science, University of Tokyo, 7–3–1 Hongo, Tokyo 113–0033
  • Sakai Fumiko
    Institute for Solid State Physics, University of Tokyo, 5–1–5 Kashiwanoha, Kashiwa, Chiba 227–8581
  • Takagi Hidenori
    Department of Advanced Materials Science, University of Tokyo, 7–3–1 Hongo, Tokyo 113–0033 CREST, Japan Science and Technology Corporation (JST)

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  • Quasiparticle Density of States of Clean and Dirty<i><i>d</i></i>-Wave Superconductors: Mixed-State Specific Heat of La<sub><b>2</b>-<i><i>x</i></i></sub>Sr<sub><i><i>x</i></i></sub>CuO<sub><b>4</b></sub>Single Crystals

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The temperature and the magnetic field dependence of the quasiparticle specific heat CQP(T, H) in La2-xSrxCuO4 single crystals has been investigated. CQP(T, H) of overdoped x=0.19 crystals obeys the scaling law predicted for “clean” d-wave systems. In contrast, for the under and optimally doped x = 0.10 and 0.16 crystals, CQP(T, H) shows the “dirty” d-wave behavior, recently discussed by Kübert and Hirschfeld, indicating a crossover from dirty to clean d-wave behavior with doping.

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