Elastic stiffness and ultrasonic attenuation of superconductor MgB2 at low temperatures

T. Ichitsubo, H. Ogi, S. Nishimura, T. Seto, M. Hirao, H. Inui

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Temperature dependencies of elastic constants and ultrasonic attenuation of a polycrystalline MgB2 showing high-Tc superconductivity are reported. An electromagnetic acoustic resonance method detected the specimen's resonance frequencies, from which we derived the elastic constants for nonporous MgB2 using micromechanics calculation. The bulk and shear moduli extrapolated to 0 K are determined to be 96.6 GPa and 74.2 GPa, respectively, which gives the Debye temperature ΘD=819 K and the coupling constant λ≈0.76-0.89 with McMillan formula. In the temperature behavior of ultrasonic attenuation, two anomalous peaks are observed near 30 K.

Original languageEnglish
Article number052514
Pages (from-to)525141-525144
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number5
DOIs
Publication statusPublished - 2002 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Elastic stiffness and ultrasonic attenuation of superconductor MgB<sub>2</sub> at low temperatures'. Together they form a unique fingerprint.

Cite this