Phonon echo in superconducting MgB2

: Pleshakov IV, Ylinen E, Paturi P, Matveev VV, Laiho R

Publisher: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY

: 2009

EPL

: EPL-EUROPHYS LETT

: 85

: 6

: 4

: 0295-5075

DOI: https://doi.org/10.1209/0295-5075/85/67001

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 T-c. The value of about 7k(B)T(c) for the energy gap was extracted from the experimental data. Copyright (C) EPLA, 2009

Physical sciences