arXiv 1102.30122011-02-15cond-mat.supr-concond-mat.str-el

Photoinduced melting of superconductivity in the high-Tc superconductor La2-xSrxCuO4 probed by time-resolved optical and THz techniques

M. Beyer, M. Beck, D. Städter, H. Schäfer, V. V. Kabanov, G. Logvenov, I. Bozovic, G. Koren, J. Demsar

备注：: 8 pages, 5 figures
DOI：: 10.1103/PhysRevB.83.214515

英文摘要：

Dynamics of depletion and recovery of superconducting state in La2-xSrxCuO_4 thin films is investigated utilizing optical pump-probe and optical pump - THz probe techniques as a function of temperature and excitation fluence. The absorbed energy density required to suppress superconductivity is found to be about 8 times higher than the thermodynamically determined condensation energy density and nearly temperature independent between 4 and 25 K. These findings indicate that during the time when superconducting state suppression takes place (~0.7 ps), a large part (nearly 90%) of the energy is transferred to the phonons with energy lower than twice the maximum value of of the SC gap and only 10% is spent on Cooper pair breaking.

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