A1 Refereed original research article in a scientific journal
Dirty limit scattering behind the decreased anisotropy of doped YBa2Cu3O7-delta thin films
Authors: Malmivirta M, Palonen H, Inkinen S, Yao LD, Tikkanen J, Huhtinen H, Jha R, Awana VPS, van Dijken S, Paturi P
Publisher: IOP PUBLISHING LTD
Publication year: 2016
Journal: Journal of Physics: Condensed Matter
Journal name in source: JOURNAL OF PHYSICS-CONDENSED MATTER
Journal acronym: J PHYS-CONDENS MAT
Article number: ARTN 175702
Volume: 28
Issue: 17
Number of pages: 6
ISSN: 0953-8984
DOI: https://doi.org/10.1088/0953-8984/28/17/175702
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-c2, were observed in all the samples. Additionally, the parameter gamma, 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-c2.
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-c2, were observed in all the samples. Additionally, the parameter gamma, 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-c2.
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