✦ LIBER ✦

Vortex dynamics and non-Ohmic current-voltage characteristics of high-Tc layered superconductors

✍ Scribed by R. Sugano; T. Onogi; Y. Murayama

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 137 KB
Volume: 235-240
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)91181-9

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✦ Synopsis

We have calculated the non-Ohmic current-voltage characteristics of anisotropic three-dimensional Josephsonjunction arrays as a model of layered high-Tc oxides. Langevin dynamic simulations are performed for various Josephson-coupling anisotropies (7 = JIl¢/JJ-¢) at finite temperature in zero and finite magnetic fields. We find that interlayer coupling gives rise to the non-vanishing critical current (Ic), and that the low-temperature phase displays non-Ohmic power-law behavior (V c< (I -It) '~-~). Moreover, in the 7-dependence of I¢, we see the twoto three-dimensional crossover associated with thermally excited vortex-antivortex pairs.

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