Phonon echo in superconducting MgB2

I. V. Pleshakov; E. Ylinen; P. Paturi; V. V. Matveev; R. Laiho

doi:10.1209/0295-5075/85/67001

All issues

Volume 85 / No 6 (March 2009)

EPL, 85 6 (2009) 67001

Abstract

Issue		EPL Volume 85, Number 6, March 2009


Article Number		67001
Number of page(s)		4
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/85/67001
Published online		26 March 2009

EPL, 85 (2009) 67001

Phonon echo in superconducting MgB₂

I. V. Pleshakov¹, E. Ylinen², P. Paturi², V. V. Matveev³ and R. Laiho²

¹ 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: petriina.paturi@utu.fi

Received: 21 October 2008
Accepted: 19 February 2009

Abstract

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 $T_{{\rm c}}$ . The value of about $7k_{{\rm B}}T_{{\rm c}}$ 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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