Dimensional crossover and flux dynamics in low- and high-{Tc} multilayers
- Katholieke Univ. Leuven (Belgium). Laboratorium voor Vaste Stof-Fysika en Magnetisme; and others
The temperature and field dependence of the flux creep rate S(T,H) = M{sub 0}{sup {minus}1} dM/d(Int) and critical current j{sub c}(T,H) have been measured in low-{Tc} (Pb/Ge) and high-{Tc} (YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7}) (YBCO/PrBCO) multilayers with different coupling strength between the superconducting layers. By taking thicker insulating separator layers, the dimensional crossover from an anisotropic 3D to a quasi 2D behavior is induced. The detailed analysis of the S(T,H) and j{sub c}(T,H) dependence made it possible to identify the pinning regimes as predicted by the collective pinning theory. In YBCO/PrBCO multilayers with completely decoupled YBCO planes, a strong enhancement of the quantum flux creep rate S(T {r_arrow} 0) has been observed. The value of S(T {r_arrow} 0) {approx} 3% in the 3D YBCO superconductor and increases up to S(T {r_arrow}0) {approx} 20% in the quasi 2D YBCO/PrBCO multilayers. The authors also used magnetic fields H > H{sub 3D{r_arrow}2D} to decouple the CuO{sub 2} planes in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (BSCCO) single crystals. A great similarity between the S(T,H{sub 0}) and j{sub c}(T,H{sub 0}) curves has been found in BSCCO, with the superconducting layers decoupled by the applied field, and in the YBCO/PrBCO with the YBCO layers decoupled by inserting thick insulating PrBCO layers.
- OSTI ID:
- 82836
- Report Number(s):
- CONF-940142-; ISBN 0-8194-1452-2; TRN: IM9533%%294
- Resource Relation:
- Conference: OE/LASE `94: conference on optics, electro-optics, and laser applications in science and engineering, Los Angeles, CA (United States), 22-29 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Superconducting superlattices and multilayers. Proceedings SPIE Volume 2157; Bozovic, I. [ed.] [Varian Associates Inc., Palo Alto, CA (United States). E.H. Ginzton Research Center]; PB: 386 p.
- Country of Publication:
- United States
- Language:
- English
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