Physics – Condensed Matter – Materials Science
Scientific paper
2005-04-05
Phys. Rev. B 72, 012509 (2005).
Physics
Condensed Matter
Materials Science
5 pages, 5 figures (fig.3 is colored), RevTeX4; the text is modified
Scientific paper
10.1103/PhysRevB.72.012509
Photoacoustic (PA) wave has been examined in a superconductor of the first kind, Pb single crystal. The PA wave is induced by optical excitation of electronic state and propagates from normal into superconductive phases below T$_{\rm C}$. It is clearly shown by wavelet analysis that the measured PA wave includes two different components. The high-frequency component is MHz-ultrasonic and the relative low-frequency one is induced by thermal wave. The latter is observed in a similar manner irrespective of T$_{\rm C}$. On the other hand, the MHz-frequency component is obviously enhanced below T$_{\rm C}$. The behavior is reproduced by the change of attenuation of longitudinal ultrasonic wave and is consistent with BCS theory.
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