Flux noise in Bi2Sr2CaCu2O8 displaying the paramagnetic Meissner effect: Evidence of spontaneous magnetic moments
J. Magnusson, P. Nordblad, P. Svedlindh
DOI 10.1103/PhysRevB.57.10929 · Physical Review B
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Abstract
Flux noise measurements of a ceramic Bi2Sr2CaCu2O8 sample displaying the paramagnetic Meissner effect (PME) have been performed in the temperature range 0.5<T/Tc<1. The frequency dependence of the zero-field noise power scales as SΦ∼1/fα with the exponent α monotonically decreasing from α≈1.2 at the lowest temperature to α≈1.0 close to the superconducting transition temperature. The superposition of a weak magnetic field suppresses the flux noise and the frequency dependence of the noise power changes in such a way that the exponent α decreases in magnitude with increasing field. The spectral noise density is found to relate to the low-field out-of-phase component of the ac susceptibility according to the fluctuation-dissipation theorem. The results favor a description of the PME in terms of fluctuating spontaneous magnetic moments with a typical magnitude of 108μB.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 66 | Pressure not reported | onset |
| YBa2Cu3O7 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 |
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