Thin and ultra-thin epitaxial films of YBa2Cu3O7−δ deposited on LiNbO3 substrates by pulsed excimer laser ablation

Guptasarma, Prasenjit ; Bendre, S. T. ; Ogale, S. B. ; Multani, M. S. ; Vijayaraghavan, R. (1992) Thin and ultra-thin epitaxial films of YBa2Cu3O7−δ deposited on LiNbO3 substrates by pulsed excimer laser ablation Physica C: Superconductivity, 203 (1-2). pp. 129-138. ISSN 0921-4534

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0921-4534(92)90518-H

Abstract

We present here detailed transport, magnetic, structural and morphological studies on thin and ultra-thin films of superconducting YBa2Cu3O7−δ (1-2-3) deposited on single crystalline substrates of LiNbO3. The films were deposited using the technique of excimer laser ablation and have been found to have their c-axis oriented perpendicular to the plane of the film. We report results for films of thickness 500 Å, 1000 Å, 1600 Å and 6000 Å. Superconducting transition temperatures (Tc) have been studied by DC-resistivity, AC- and DC-magnetization. Critical current densities (Jc) from transport measurements are found to be in excess of 105 A/cm2 at 77 K. The temperature dependence of Jc is also examined and the flux pinning energy is estimated within the flux creep picture. High field hysteresis loop studies are in agreement with the above results and yield meaningful indications of critical fields Hc and irreversibility fields Hr. A study of the evolution of film morphology with increase of film thickness is also reported and it reflects on the growth mechanism of 1-2-3 on LiNbO3.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:61855
Deposited On:15 Sep 2011 11:54
Last Modified:06 Jul 2012 08:14

Repository Staff Only: item control page