Texture and magnetic anisotropy of YBa 2 Cu 3 O 7-x film on MgO substrate
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Texture and magnetic anisotropy of YBa2Cu3O7-x film on MgO substrate H. Sanchez Cornejo1, L. De Los Santos Valladares2,3,* N. O. Moreno4, and A. Bustamante Domı´nguez1
, C. H. W. Barnes3,
1
Laboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima 14, Perú 2 School of Materials Science and Engineering, Northeastern University, No 11, Lane 3, Wenhua Road, Heping District, Shenyang 110819, Liaoning, People’s Republic of China 3 Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Ave., Cambridge CB3 0HE, UK 4 Departamento de Física, Universidade Federal de Sergipe, São Cristóvão, SE 49100-000, Brazil
Received: 6 July 2020
ABSTRACT
Accepted: 7 October 2020
The texture and magnetic anisotropy of a YBa2Cu3O7-x (YBCO) film growth onto a MgO substrate are analyzed in order to understand the relation between them. X-ray diffraction shows the presence of the (00l) reflections from the YBCO layer with a grain’s fraction value 98%. Rocking Curves (RC) measurements reveal an out-of-plane texture with a full width at the half maximum of 0.81°, revealing a high uniaxial texture in the YBCO film. The temperature dependence of the susceptibility measurements obtained under many applied fields along Hext ||c-axis and Hext||ab-plane reveals strong relationship between the uniaxial texture and the magnetic anisotropy, confirming the high ordering of the CuO2 superconducting planes. In addition, the critical current density values are obtained from the hysteresis loops and compared to similar YBCO films with uniaxial and biaxial texture reported elsewhere.
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The Author(s) 2020
1 Introduction The importance of electrical transport properties in superconducting materials has led to an extensive experimental research and development of highly textured layers of YBa2Cu3O7-d (YBCO) on a variety of substrates [1]. Due to the anisotropy of YBCO, it is necessary to use epitaxial layers with a biaxial textured YBCO (i.e., with good out-of-plane and in-
plane texture) to achieve critical current densities higher than 106 A/cm2 at 77 K [2]. In thin films, texture is referred to the relative ordering of crystallites to a particular direction of growth, called texture axis [2, 3]. Texture can be uniaxial or biaxial, depending on the prevalence of one or two directions of arrangement of the superconducting grains, respectively. Quantifying the degree of texture in YBCO layers is commonly achieved by various experimental techniques, such as
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https://doi.org/10.1007/s10854-020-04623-w
J Mater Sci: Mater Electron
X-ray diffraction (pole figure (u and w-scans) and xscan), Raman spectroscopy, optical techniques, transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The degree of texture out-of-plane direction is estimated by h-2h and x-scans, while a measure of the degree of texture in the plane can be achieved by means of a meas
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