Nonlinear electrodynamics in the granular superconductor YBa2Cu3O7: Experiments and interpretation
C. D. Jeffries, Q. H. Lam, Y. Kim, C. M. Kim, A. Zettl, M. P. Klein
DOI 10.1103/PhysRevB.39.11526 · Physical Review B
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Abstract
For bulk samples of superconducting YBa2Cu3O7 powder and pellets subject to a dc magnetic field H0 and a parallel ac magnetic field H1 at frequency f∼103 to 105 Hz, we report data on the generated harmonic power P(nf) up to harmonic n≈40, finding: (1) If H0=0, only odd harmonics; (2) if H0≠0, even harmonics are additionally generated; (3) for H1 sufficiently large (≳ 10 Oe) and n large, then P(nf) vs H0 displays sharp and deep periodic dips, revealing a remarkably consistent and reproducible macroscopic flux quantization for the bulk sample. These data, as well as the relative intensities of the harmonic power, are found to be in semiquantitative agreement with detailed numerical predictions of a dynamical model of the material as a suitably averaged ensemble of prototype flux quantized loops with weak links. At lower values of H1 additional structure is observed, related to fluxon pinning and depinning.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
| Bi4Sr3Ca3Cu4O 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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