Magnetic field and temperature dependence of thermal activated dissipation in epitaxial thin films of Bi2Sr2Ca(Cu1−xCox)2Od superconductors

✍ Scribed by G. Ilonca; V. Toma; T.R. Yang; A.V. Pop; P. Balint; M. Bodea; E. Macocian

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 145 KB
• Volume: 460-462
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.053

✦ Synopsis

The scaling behavior of the effective activation energy of high-quality epitaxial c-oriented Bi 2 Sr 2 Ca(Cu 1Àx Co x ) 2 O d thin films with 0 6 x P 0.025 has been studied as a function of temperature and magnetic field. For all samples, the effective activation energy scales as U(T, l 0 H) = U 0 (1ÀT/T c ) m H n with exponent m = 1.25 ± 0.03, n = À1/2 and the field scaling 1/l 0 H and ÀUl 0 H for thick films and ultra thin films, respectively. The results are discussed taking account of the influence of the Co substitution with a model in which U(T, H) arises from plastic deformations of the viscous flux liquid above the vortex-glass transition temperature.