Showing papers by "Jean-Marc Triscone published in 1992"
TL;DR: In this paper, the resistive transition in a magnetic field perpendicular or parallel to the layers is studied and the results can be used to gain insight into the role of the anisotropy for the dissipative behavior of these high temperature superconductors.
Abstract: The high temperature superconducting cuprates are layered materials in which the CuO2 layers are found to play an important role for the superconducting properties. When produced in thin film form, these materials can be grown in a layer by layer sequence and this has allowed us to make superlattices of various combinations of these compounds. In particular, in the YBa2Cu3O7/PrBa2Cu3O7 system it is possible to produce superlattices where the individual layers are as thin as one c-axis unit cell. This allows us to modify the anisotropy of these materials in a controlled manner. In this contribution we present a study of the resistive transition in a magnetic field perpendicular or parallel to the layers, and how the results can be used to gain insight into the role of the anisotropy for the dissipative behaviour of these high temperature superconductors.
14 citations
TL;DR: In this paper, the surface structure of magnetron-sputtered YBa 2 Cu 3 O 7 thin films has been investigated using an STM operated in air, and different types of step and plateau structures are observed depending on the deposition conditions and substrates used (SrTiO 3 and MgO).
9 citations
TL;DR: In this paper, the authors investigated the thermally activated flux flow as observed in the resistive tails of the superconducting transition and found that the activation energy varies proportional to the thickness of the individual YBCO layers.
Abstract: The fabrication of epitaxially grown superlattices and ultrathin films made from high temperature superconductors has allowed a systematic study of certain properties of this class of materials. It is, for instance, possible to modify the anisotropy in a controlled manner and thus investigate the role of the reduced dimensionality of the high temperature superconductors on the superconducting properties. In particular, we have investigated the thermally activated flux flow as observed in the resistive tails of the superconducting transition. We find in YBa2Cu3O7/PrBa2Cu3O7 (YBCO/PrBCO) superlattices that the activation energy varies proportional to the thickness of the individual YBCO layers when the PrBCO thickness is large enough to decouple the superconducting layers (d-PrBCO > 36 A). We thus find that the pancake vortices in the individual CuO2 layers in YBCO are strongly coupled and that the flux line lattice is 2D in the thin individual YBCO layers up to layer thicknesses of more than 200 A. An analysis of the zero field resistive transition in terms of Coulomb gas scaling confirms this result.
5 citations
TL;DR: In this article, the growth of a-axis-oriented YBa2Cu3O7/PrBa2C3O 7 superlattices and their transport properties are reported.
4 citations
01 Jan 1992
TL;DR: In this article, a review of recent work on the properties of YBa2Cu3O7 / PrBa2C3O 7 superlattices is presented. But the authors focus on the role played by the interlayer coupling in the high temperature superconductors.
Abstract: This paper reviews recent work on the properties of YBa2Cu3O7 / PrBa2Cu3O7 superlattices. The study of these materials allows one to obtain important information about the role played by the interlayer coupling in the high temperature superconductors. Furthermore, investigations of the resistive transition in a magnetic field has shed new lights on the physical process leading to the dissipation in the superconducting state.
1 citations