Suppression of the "notch effect” in microwave surface resistance in YBa2Cu3O7 films on MgO (100) substrate by deposition of ultra-thin SrTiO3 seed layers

This article has an erratum: [erratum]

Issue		Eur. Phys. J. Appl. Phys. Volume 5, Number 1, January 1999


Page(s)		3 - 8
DOI		10.1051/epjap:1999100

DOI: 10.1051/epjap:1999100

Eur. Phys. J. AP 5, 3-8

Suppression of the "notch effect'' in microwave surface resistance in YBa₂Cu₃O₇ films on MgO (100) substrate by deposition of ultra-thin SrTiO₃ seed layers

J.-P. Contour¹ - C. Couvert¹ - O. Durand² - Y. Lemaître¹ - R. Lyonnet¹ - and B. Marcilhac¹

¹ Unité Mixte de Physique CNRS / Thomson-CSF, 91404 Orsay, France
² LCR / Thomson-CSF, 91404 Orsay, France
contour@thomson-lcr.fr

Received: 28 May 1998 / Revised: 30 September 1998 / Accepted: 1st October 1998

Abstract
RHEED controlled ultra-thin buffer layers of $\rm SrTiO_3$ have been deposited on (100) MgO by pulsed laser deposition to growth YBaCuO films for microwave applications. A buffer layer with a thickness between 2 and 15 nm, i.e. 5 to 40 unit cells of $\rm SrTiO_3$ , is sufficient to expand to more than 60 $^\circ$ C the range of deposition temperatures leading to low microwave surface resistance. The Rs values are as good as those obtained on $\rm LaAlO_3$ substrates with a slighly lower magnetic field dependency. The $\rm SrTiO_3$ seed layer induces an oriented epitaxial growth with YBCO [100] // MgO [100] over this range of deposition temperatures.

PACS
74.75 Superconductor films - 81.15.i Pulsed laser deposition - 74.70.v Perovskite phase superconductors - 74.30.g Superconductor response to electromagnetic fields

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Suppression of the "notch effect'' in microwave surface resistance in YBa2Cu3O7 films on MgO (100) substrate by deposition of ultra-thin SrTiO3 seed layers

Suppression of the "notch effect'' in microwave surface resistance in YBa₂Cu₃O₇ films on MgO (100) substrate by deposition of ultra-thin SrTiO₃ seed layers