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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Superconductivity

thermal conductivity

high-Tc superconductors

YBa2Cu3O7

YBa2Cu4O8

defect scattering

phonon transport

Condensed matter physics

Kondenserade materiens fysik

Superconductivity

Supraledning

fysik

Physics

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