Critical-state model for harmonic generation in high-temperature superconductors
L. Ji, R. H. Sohn, G. C. Spalding, C. J. Lobb, M. Tinkham
DOI 10.1103/PhysRevB.40.10936 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
High-temperature superconductors exhibit harmonic generation when immersed in an ac magnetic field. To explain this phenomenon, we propose a macroscopic critical-state model as an alternative to the loop model used by Jeffries et al. While the original Bean model of the critical state only predicts odd harmonics, our extended model also predicts even harmonics by taking into account the dependence of the critical current upon magnetic field. The results of our measurements of harmonic signals as a function of ac magnetic field, dc magnetic field, temperature, and harmonic number are consistent with the proposed model. In particular, we find that, as the magnetic field is increased, the critical current crosses over from the Bean regime, where Jc is independent of field, to the Anderson-Kim regime, where Jc is approximately inversely proportional to the field.
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. | 77 | Pressure not reported | unknown |
Similar papers
Coherent harmonic generation in superconductors for various critical-state models
similarity 0.98M. W. Johnson et al.
Source status unknown — claims are unverified
Frequency dependence of the local ac magnetic response in type-II superconductors
similarity 0.96R. Prozorov et al.
Source status unknown — claims are unverified
Temperature dependence of the activation energy at low magnetic induction in high-Tc superconductors
similarity 0.95Z. D. Wang et al.
Source status unknown — claims are unverified
Prediction of decoupling in high-temperature superconductors
similarity 0.95Paul P. Durand & Lyle H. Ungar
Source status unknown — claims are unverified
New approach to characterizing the high-temperature superconducting transition
similarity 0.95T. Datta et al.
Source status unknown — claims are unverified
Nature and stability of the ‘‘60-K superconducting phase’’ in the YBa2Cu3O7−δ system
similarity 0.95C. N. R. Rao et al.
Source status unknown — claims are unverified