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arXiv · 1102.3012

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
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Abstract

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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M. Beyer, M. Beck, D. Städter, H. Schäfer, V. V. Kabanov, G. Logvenov, I. Bozovic, G. Koren, J. Demsar. 2011-02-15. Photoinduced melting of superconductivity in the high-Tc superconductor La2-xSrxCuO4 probed by time-resolved optical and THz techniques. https://doi.org/10.1103/physrevb.83.214515

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