Abstract
The current-voltage characteristics of a single-crystal whisker of the 2:2:1:2 phase of bismuth strontium calcium copper oxide have been measured over a wide range of temperatures and magnetic fields. In low magnetic fields there are indications of a phase transition. In higher magnetic fields the current-voltage characteristics obey powerful scaling relationships. In large fields and low currents we find that the dissipation has a number of the characteristics of the thermally activated flux creep (TAFC) model of Kim and Anderson, in particular the temperature and magnetic field dependences of the barrier height obey the typical behaviour for that class of model. However, the flux-bundle parameters must be taken as temperature dependent. At high fields and high currents the observed behaviour differs very significantly from the TAFC prediction.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
