Abstract
Temperature-dependent resistivity ρ(T) was measured from Tc to 1100K in ceramic samples of La1.825Sr0.175CUO4 (LSCO) and YBa2Cu3O7 (YBCO). Measurements above 300K were performed in a flow of O2. In LSCO ρ(T) is linear to 1100K; in YBCO ρ(T) is linear to 600K, increases faster than linear at T>600K, owing to the loss of oxygen, and shows a break in slope at the structural phase transition near 950K. It is argued that the observed absence of saturation in the linear parts of the data implies weak electron-phonon coupling in both superconductors, and, coupled with absolute values of the resistivity, places constraints on band structure parameters. Our results take anisotropy into account explicitly and are combined with recent μSR measurements of the penetration depth to obtain experimental estimates of the plasma energy.
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Gurvitch, M., Fiory, A.T. (1987). Absence of Resistivity Saturation and its Implications for the High Tc Superconductors. In: Wolf, S.A., Kresin, V.Z. (eds) Novel Superconductivity. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1937-5_76
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