A Model of The Temperature Dependence of the Contrast of Lorenz Microscopy Images in a Type II Superconductor
Abstract
Lorentz microscopy produces time-resolved images of magnetic flux lines moving through type-II superconductors. These images are produced by the interactions of electrons with the magnetic structure of the vortices. The size of the vortex is set in part by the London penetration depth, which is temperature dependent. This size affects the contrast in the resultant Lorentz image. We demonstrate that the local contrast in Lorentz images reflects the local temperature through the temperature dependence of the London penetration depth. Measuring this contrast allows the extraction of temperature information in the field of view. Specifically, images of a niobium thin film sample are analyzed and show these temperature effects.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2001
- Bibcode:
- 2001APS..MARQ28013S