Volume 85, Number 6, March 2009
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 March 2009|
Phonon echo in superconducting MgB2
Laboratory for Quantum Electronics, A.F. Ioffe Physico-Technical Institute, Russian Academy of Sciences 194021, Saint Petersburg, Russia
2 Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku FI-20014 Turku, Finland, EU
3 Department of Quantum Magnetic Phenomena, St.-Petersburg State University - 198504 Saint Petersburg, Russia
Corresponding author: email@example.com
Accepted: 19 February 2009
The phonon echo excited by radio-frequency pulses in superconducting MgB2 in external magnetic field was studied. Using the echo technique two contributions to ultrasound attenuation are observed: low-temperature relaxation, which depends on the magnetic field, and a decay connected to the superconducting energy gap at temperatures close to . The value of about for the energy gap was extracted from the experimental data.
PACS: 74.25.Ld – Mechanical and acoustical properties, elasticity, and ultrasonic attenuation / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impe- dance, etc.) / 74.70.Ad – Metals; alloys and binary compounds (including A15, MgB2, etc.)
© EPLA, 2009
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