Defects and the thermal conductivity of YBa2Cu3O7-d and YBa2Cu4O8

• We present below the first measured data for the thermal diffusivity and the thermal conductivity, λ, of dense, sintered ceramic YBa2Cu4O8 (1-2-4) as a function of temperature T between 40 and 310 K. At 300 K, λ is 6.3 Wm−1K−1, increasing with decreasing T to about 9.5 Wm−1K−1 near Tc. This T dependence is much stronger than in YBa2Cu3O7−δ (1-2-3). Only a very small enhancement is observed in λ below Tc. As in 1-2-3, λ is mainly limited by phonon scattering by defects.

Nyckelord

Superconductivity

thermal conductivity

high-Tc superconductors

YBa2Cu3O7

YBa2Cu4O8

defect scattering

phonon transport

NATURAL SCIENCES Physics Condensed matter physics

NATURVETENSKAP Fysik Kondenserade materiens fysik

NATURAL SCIENCES Physics Condensed matter physics Superconductivity

NATURVETENSKAP Fysik Kondenserade materiens fysik Supraledning

Physics

fysik

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kon (ämneskategori)

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