Abstract
The thermopower of Andreev interferometers, which are doubly connected loops in which one arm is a superconductor and one arm is a normal metal, oscillates as a function of magnetic field with a fundamental period corresponding to a flux quantum h/2e through the area of the loop. While the magnetoresistance of an Andreev interferometer is symmetric with respect to the magnetic field, the thermopower can be either symmetric or antisymmetric, depending on the topology of the sample. The temperature dependence of the thermopower oscillations is nonmonotonic. This nonmonotonic behavior does not appear to be related to the reentrance observed by many groups in the conductance of normal-metal/superconductor (NS) structures.
Original language | English (US) |
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Pages (from-to) | 733-743 |
Number of pages | 11 |
Journal | Superlattices and Microstructures |
Volume | 25 |
Issue number | 5 |
DOIs | |
State | Published - May 1999 |
Funding
Acknowledgements—We thank C. Lambert, C. Van Haesendonck, G. Neuttiens and C. Strunk for valuable discussions. This work was supported by the NSF under DMR-9801982, and by the David and Lucile Packard Foundation.
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Electrical and Electronic Engineering