Unusual Photon Energy Dependence of the Cooper Pair Breaking Rate in YBa2Cu3O7−δ Epitaxial Thin Films.

Authors :: Zhao, Y.
Cao, W.
Li, J.
Drew, H.
Shreekala, R.
Lee, C.
Pai, S.
Rajeswari, M.
Ogale, S.
Sharma, R.
Baskaran, G.
Venkatesan, T.
Source :: Journal of Superconductivity; Oct1999, Vol. 12 Issue 5, p675-680, 6p
Publication Year :: 1999
Abstract: The transient photoimpedance response of epitaxial YBa<subscript>2</subscript>Cu<subscript>3</subscript>O<subscript>7−δ</subscript> thin films has been studied using 100 fs Ti:Sapphire laser pulse excitation. Both temperature and photon energy dependence of the fast optical response signal (whose temperature dependence can be explained by a kinetic inductance model involving Cooper pair breaking) were studied. The pair breaking rate is strongly photon energy-dependent, with a resonance around 1.5 eV with a width of only 100 meV, which is very surprising given the strong electron correlation in this metallic system and may be explained in terms of the stripe phase model. [ABSTRACT FROM AUTHOR]

Full Text Access

Tools