Algebraic decay of fluxoid-dynamics in the BSCCO high-Tc superconductor

✍ Scribed by R. Behr; J. Kötzler; A. Spirgatis; M. Ziese

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 332 KB
• Volume: 191
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/0378-4371(92)90569-c

✦ Synopsis

From measurements

of the complex ac-susceptibility between 3 Hz and 2 MHz on a dense ceramic cylinder in a field of 1 tesla the complex frequency-dependent penetration depth h,,(w) is evaluated.

A novel algebraic law, hiC(w, T) -(ior,,)'(r) is obtained, the exponent of which drops discontinuously to low values (p S 0.2) at the glass transition T, = 20 K and increases linearly to the conventional value /3 = 1 at T, = 70 K. Above T, the dynamics indicates a vortex liquid (p = 1) defining an intrinsic transition, which unlike the irreversibility line does not depend on external parameters like sample radius and observation time.