Large "forbidden" change in elastic modulus at the superconducting transition of Y1Ba2Cu3O9−x
H. Mathias, W. Moulton, H. K. Ng, S. J. Pan, K. K. Pan, L. H. Peirce, L. R. Testardi, R. J. Kennedy
DOI 10.1103/PhysRevB.36.2411 · Physical Review B
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Abstract
The torsional modulus of Y1Ba2Cu3O9−x, measured by the composite oscillator method, shows a softening of ≃1% on cooling through the superconducting transition. The change is 3 to 4 orders of magnitude larger than that in an average modulus for a typical superconductor. For the high symmetry implied by our polycrystalline sample, furthermore, no change is allowed by symmetry for this mode at the superconducting (or any Landau-type) transition. The decrease in modulus is accompanied by an increase in damping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O9-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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