Negative thermal expansion of MgB2 in the superconducting state and anomalous behavior of the bulk Grüneisen function
J. J. Neumeier, T. Tomita, M. Debessai, J. S. Schilling, P. W. Barnes, D. G. Hinks, J. D. Jorgensen
DOI 10.1103/PhysRevB.72.220505 · Physical Review B
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Abstract
The thermal expansion coefficient α of MgB2 is revealed to change from positive to negative on cooling through the superconducting transition temperature Tc. The Grüneisen function also becomes negative at Tc followed by a dramatic increase to large positive values at low temperature. The results suggest anomalous coupling between superconducting electrons and low-energy phonons.
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. | 38.7 | Pressure unresolved | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.7 | 0.63 GPa | midpoint |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 41.8 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.8 | Pressure not reported | unknown |
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