Spin-fluctuation-induced superconductivity in YBa2Cu3O6.9
Kevin S. Bedell, David Pines
DOI 10.1103/PhysRevB.37.3730 · Physical Review B
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Abstract
We show that, independent of the choice of values for the carrier concentration n and specific heat in the normal state, existing experiments on the superconducting properties of polycrystalline YBa2Cu3O6.9 are consistent with calculations carried out in the clean limit. We find, for a wide choice of n, a substantial exchange enhancement of the Pauli susceptibility. For n<5×1021 cm−3, long wavelength spin fluctuations, with a characteristic temperature, TSF∼600 K, can give rise to a strong-coupling superconducting transition to a triplet Balian-Werthamer phase. On the other hand, if n>1022 cm−3 antiferromagnetic spin fluctuations must be invoked if the pairing is of magnetic origin.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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