Quantized flux states in composite superconducting loops for probing unconventional pairing symmetry
Abstract
The newly discovered iron-pnictide superconductors pose a challenge in the determination of pairing symmetry using standard phase-sensitive techniques. The heart of the problem lies in the fundamental constraints imposed by the complex Fermi surface structure, the lack of high-quality epitaxial films and large single crystals, and the difficulty in the junction fabrications. To circumvent the aforementioned problems, we have developed a new phase-sensitive test using quantized flux states in a composite loop composed of a conventional s-wave superconductor and a polycrystalline unconventional superconductor. The general principle of using such a configuration to capture the sign change in the order parameter and the specific experimental examples will be discussed in this talk.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2010
- Bibcode:
- 2010APS..MARH39008T