Journal
PHYSICAL REVIEW B
Volume 62, Issue 5, Pages 3554-3558Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.3554
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A residual linear term is observed in the thermal conductivity of optimally doped Bi2Sr2CaCu2O8 at very low temperatures whose magnitude is in excellent agreement with the value expected from Fermi-liquid theory and the d-wave energy spectrum measured by photoemission spectroscopy with no adjustable parameters. This solid basis allows us to make a quantitative analysis of thermodynamic properties at low temperature and establish that thermally excited quasiparticles are a significant, perhaps even the dominant, mechanism in suppressing the superfluid density in cuprate superconductors Bi2Sr2CaCu2O8 and YBa2Cu3O7.
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