Phase-Resolved I-V Characteristics in the Mixed State of YBa2Cu3O7

Autor(en)

C. Fussenegger, W. Lang, P. Schwab, S. Proyer, D. Bäuerle

Abstrakt

An investigation of the I–V characteristics in YBa₂Cu₃₃O₇

microbridges in a magnetic field of 2 T using low-frequency

phase-sensitive lock-in technique for small currents and a pulsed method

for high current densities is reported. With low current densities j and at high temperatures close to T_c an ohmic behavior is observed, indicating thermally assisted flux flow. When j > 10⁴ A/cm²,

a non-linear region with power law dependence is entered. On the other

hand, towards lower temperatures, the curvature is entirely negative and

a phase lag between current and voltage appears. This behavior is

interpreted as a slowing-down of the vortex dynamics when approaching

the vortex-glass state. The critical phase at the glass transition

temperature is 72.7° and at lower temperatures the maximum phase shift

is 90° corresponding to the dissipation-free state.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica C: Superconductivity and its Applications

Band

235-240

Seiten

3143-3144

Anzahl der Seiten

2

DOI

https://doi.org/10.1016/0921-4534(94)91098-7

Publikationsdatum

1994

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/8a63dbe7-8961-4180-a0af-916883d31950