Abstract
A ceramic sample of Y Ba2Cu4O8 (Y124) was synthesized at atmospheric pressure with the addition ofNaNO3 as an enhancer. The internal friction was measured from liquid nitrogentemperature to room temperature at kilohertz frequency using the vibrating reedmethod. Instead of a broad internal friction peak around 220 K observed inY Ba2Cu3O7−δ (Y123) a small step in the internal friction spectrum was observed around 200 K with increaseof temperature in Y124. This internal friction behaviour is similar to that of Sr-substitutedY Ba0.8Sr1.2Cu3O7−δ. We expect that the internal friction step in Y124 originates from charge carriercrossover. The small size of the change in internal friction around 200 K in Y124 isdue to suppression of the lattice response compared with that in undoped Y123.
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