NDLI: New Insights on the Intrinsic Anisotropy of YBCO Films

Content Provider	Springer Nature Link
Author	Al Naafa, Mohammad
Copyright Year	2010
Abstract	Careful investigation of the angular dependence of resistivity ρ(θ) (θ is the angle between the magnetic field and the ab-planes) and the temperature dependence of resistivity ρ(T) within the superconducting transition in an applied magnetic field B up to 1 T for a series of YBa$_{2}$Cu$_{3}$O$_{7−δ }$ (YBCO) thin films revealed a large variation of intrinsic anisotropy factor γ. The series of films studied included both optimally doped and underdoped samples of different T $_{c}$, critical current density J $_{c}$, film thickness, and preparation techniques. The variation in the shape and depth of the minimum measured for ρ(θ) near θ=0° could be directly correlated to the intrinsic anisotropy of the YBCO films. The results of fitting of ρ(θ) using Bardeen–Stephen theory allowed a quantitative determination of the value of γ which varies between 7 and 230, and is independent of T $_{c}$, film thickness, or J $_{c}$. The sharper the minimum in ρ(θ) around θ=0° the larger is the anisotropy. For highly anisotropic film, ρ(θ) showed an identical behavior for B ∥ J and B ⊥ J (i.e., ρ(θ) is independent of the angle θ between B and J for this film). The large variation in γ could be attributed to the “buckling” of the CuO$_{2}$ planes.
Starting Page	1407
Ending Page	1417
Page Count	11
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	23
Issue Number	7
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2010-06-11
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thin films YBCO Anisotropy Angular resistivity Characterization and Evaluation of Materials Magnetism, Magnetic Materials Strongly Correlated Systems, Superconductivity Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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