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Photoinduced Conductivity Dynamics Studies of MgB2 Thin Films

Journal Article · · International Journal of Modern Physics B
 [1];  [1];  [1];  [2];  [2];  [2];  [2]
  1. Los Alamos National Laboratory, MS K764, Los Alamos NM 87545,, USA
  2. National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
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We present the first direct studies of photoinduced Cooper-pair breaking and subsequent superconducting state recovery dynamics by means of femtosecond time-resolved optical-pump terahertz probe spectroscopy focusing on the superconducting state recovery dynamics in MgB2. The superconducting state recovery proceeds on the timescale of several hundred picoseconds and shows a strong temperature dependence. In particular, upon increasing the temperature the recovery time first decreases, reaches a minimum, followed by a quasi-divergence upon further increasing the temperature towards Tc. Moreover, the recovery time shows virtually no intensity dependence, even though the photoexcitation fluence is changed by over an order of magnitude. This suggests that pair recovery is goverend by a phonon-bottleneck mechanism, where the lifetime of high energy phonons (ℏω > 2Δ) is governed by their anharmonicity.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
818853
Report Number(s):
LA-UR-03-2610
Journal Information:
International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Journal Issue: 18n20 Vol. 17; ISSN 0217-9792
Publisher:
World Scientific
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE