Random telegraph signals in high-temperature superconductors
Mark Johnson, M. J. Ferrari, Frederick C. Wellstood, John Clarke, M. R. Beasley, A. Inam, X. D. Wu, L. Nazar, T. Venkatesan
DOI 10.1103/PhysRevB.42.10792 · Physical Review B
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Abstract
The local magnetization of YBa2Cu3O7−x and Bi2Sr2CaCu2O8+y measured with a superconducting quantum-interference device is shown to exhibit random telegraph signals (RTS’s) over narrow ranges of temperature. We believe these signals arise from the thermally activated hopping of single magnetic vortices between two pinning sites. The spectral density of the RTS is Lorentzian; from the temperature dependence of the characteristic time, we deduce pinning energies of 0.17 and 0.20 eV for samples of YBa2Cu3O7−x and Bi2Sr2CaCu2O8+y, respectively, at reduced temperatures of 0.99 and 0.87. The amplitudes of various RTS’s imply flux hopping distances varying from 0.2 to 30 μm. Multiple metastable states and transitions between ‘‘noisy’’ and ‘‘quiet’’ states are also observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89.8 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | unknown |
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