caa a22 4500 445381981 CHVBK 20180317143020.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-1042-z doi (NATIONALLICENCE)springer-10.1007/s10948-010-1042-z Abdelhadi M. Department of Physics, University of Hail, PO Box 2440, Hail, Saudi Arabia aut Abnormal Behavior of the Angular Dependence of Resistivity inYBCOThin Films [Elektronische Daten] [M. Abdelhadi] Careful investigation of the angular dependence of resistivity ρ(θ) (θ is the angle between the magnetic field and the ab-planes) as a function of the temperature within the superconducting transition in an applied magnetic field B up to 1 T for a series of YBa2Cu3O7−δ (YBCO) thin films revealed a large variation in the shape and width of the minimum displayed in the vicinity of θ=0°, from a flat to a very sharp behavior. The series of films studied included both optimally doped and underdoped samples of different T c, critical current densityJ c, film thickness, and preparation techniques. ρ(θ) measured for B close to θ=0° (B parallel to ab-planes) for both B‖J and B⊥J (J is the applied current density) showed two classes of samples; class of samples where ρ(θ) is independent of the direction of B relative to J and the other class where ρ(θ) depends on the orientation B relative toJ. This unusual unique behavior motivated us to investigate its origin by looking at the scaling of ρ(θ) as a function of the reduced field. Scaling of ρ(θ)) with the reduced field B(γ −2cos 2 θ+sin 2)1/2 allowed a quantitative determination of the value of γ (intrinsic anisotropy) which varies between 7 and 400, and is independent of film thickness and J c. Analysis of the microstructure though XRD of the films studied showed that the anisotropy is related to microstrain of the films. Springer Science+Business Media, LLC, 2010 YBCO thin films nationallicence Magnetic properties nationallicence Transport measurements nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 741-746 1557-1939 24:1-2<741 2011 24 10948 https://doi.org/10.1007/s10948-010-1042-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1042-z text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Abdelhadi M. Department of Physics, University of Hail, PO Box 2440, Hail, Saudi Arabia aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 741-746 1557-1939 24:1-2<741 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer