Fluctuation effects in the microwave conductivity of cuprate superconductors
J. R. Waldram, D. M. Broun, D. C. Morgan, R. Ormeno, A. Porch
DOI 10.1103/PhysRevB.59.1528 · Physical Review B
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Abstract
Observations on the surface impedance at 14, 25, and 36 GHz of high quality crystals of Bi2Sr2CaCu2O8+x (Bi2212), Tl2Ba2CuO6 (Tl2201), and YBa2(Cu0.975Zn0.025)3O7−δ (Y123/Zn) are reported, and the corresponding complex conductivity σ=σ′−iσ″ is analyzed in the critical region near Tc and at higher temperatures where fluctuations are important. The well known sharp peak in σ′ within the critical region is successfully analyzed using effective medium theory. At higher temperatures Bi2212 and Y123/Zn agree in form with the treatment of conductivity fluctuations of Aslamazov and Larkin, extended to high frequency. Tl2201, however, shows an extra response of long relaxation time which persists at high temperatures. Tentative explanations of this effect are considered, including the possibility that it is due to uncondensed bipolarons. The physics of conversion of supercurrent to normal current within fluctuating regions is reviewed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2(Cu0.975Zn0.025)3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl1.85Ba2Cu1.15O6 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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