Elastic stiffness and ultrasonic attenuation of superconductor MgB2 at low temperatures
T. Ichitsubo, H. Ogi, S. Nishimura, T. Seto, M. Hirao, H. Inui
DOI 10.1103/PhysRevB.66.052514 · Physical Review B
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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=819K 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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