Fluctuations in the Hall conductivity and dynamics of the order parameter in YBa2Cu3O7−δ superconductors
A. V. Samoilov
DOI 10.1103/PhysRevB.49.1246 · Physical Review B
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Abstract
Fluctuation contributions to the Hall and longitudinal conductivities in YBa2Cu3O7−δ epitaxial films have been investigated. Two remarkable features were observed: (1) the fluctuation contribution to the Hall conductivity, σxyfl, changes sign at temperatures T*(H)>Tc(H=0) and (2) the ratio σxyfl/σxxfl where σxxfl is the fluctuation longitudinal conductivity, shows a sharp minimum near Tc(H). These features may reflect an unusual behavior of the imaginary part of the relaxation time of the order parameter in the vicinity of the transition temperature.
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. | 90 | Pressure unresolved | midpoint |
| EuBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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