Ion-channeling investigation of thermal vibrational amplitudes across the superconducting transition in YBa2Cu3O7−δ
R. P. Sharma, L. E. Rehn, P. M. Baldo, J. Z. Liu
DOI 10.1103/PhysRevB.38.9287 · Physical Review B
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Abstract
Ion-channeling measurements reveal that the thermal vibrational amplitude, u1, decreases markedly from 0.008 to 0.0056 nm as the temperature of orthorhombic single crystals of YBa2Cu3O7−δ is lowered from 300 to 220 K. The rate of this decrease slows at lower temperatures, with u1 reaching a value of 0.0042 nm at 100 K. Further cooling of the sample across the superconducting transition region (to 85 K) produces an abrupt, additional decrease in u1 to 0.0035 nm. This abrupt lattice stiffening corresponds to an ∼140 K increase in Debye temperature across the superconducting transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | onset |
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