Dirty limit scattering behind the decreased anisotropy of doped YBa2Cu3O7−δ thin films. (5th April 2016)

• Record Type: Journal Article
• Authors: Malmivirta, M; Palonen, H; Inkinen, S; Yao, L D; Tikkanen, J; Huhtinen, H; Jha, R; Awana, V P S; van Dijken, S; Paturi, P
• Is Part Of: Journal of physics. Volume 28:Number 17(2016)
• Publication Date: 2016-04-05
• Subjects: anisotropy -- artificial pinning centers -- critical fields -- pulsed-laser deposition -- YBCO; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/17/175702
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We measured the resistivity of pulsed-laser-deposited BaCeO3 (BCO)-doped YBCO thin films containing spherical BCO particles in fields up to 30 T. The average diameter of the particles depends on the dopant concentration being below 4 nm in all the samples. Raised values of the upper critical field, B c 2, were observed in all the samples. Additionally, the parameter γ, describing the electron mass anisotropy, decreased from 6.2 in the undoped sample to 3.1 in the 8 wt.% BCO-doped sample. These results can be explained by the increased number of defects decreasing the mean free path of electrons and thus lowering the coherence length, which in turn increases B c 2 .