Microwave observation of magnetic field penetration of high-Tc superconducting oxides
K. Khachaturyan, E. R. Weber, P. Tejedor, Angelica M. Stacy, A. M. Portis
DOI 10.1103/PhysRevB.36.8309 · Physical Review B
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Abstract
Microwave methods, using a conventional EPR spectrometer, have been applied to a study of magnetic field penetration of the high-Tc superconducting oxides La1.85Sr0.15CuO4, YBa2Cu3O7, and EuBa2Cu3O7. Signals over 105 times the sensitivity limit of the EPR spectrometer were obtained. Huge low-field peaks were observed in the superconducting phase for magnetic fields below 10 G. The peak signal decreased exponentially with temperature just below Tc. These observations are taken as evidence of the spin-glass features of these materials and of fluxoid penetration of intrinsic Josephson junctions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| EuBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.5 | Pressure not reported | onset |
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