Measurements of micron-size doubly connected normal-metal/superconductor (NS) heterostructures show a thermoelectric response which oscillates as a function of magnetic field, with a fundamental period corresponding to one flux quantum h/2e through the area of the loop. The oscillations of the thermopower are either symmetric or antisymmetric with respect to magnetic field, depending on the topology of the sample. The temperature dependence of the amplitude of the oscillations shows a minimum at a temperature of 0.14 K, although this nonmonotonic behavior does not appear to be related to the reentrance effect recently observed in the electrical transport properties of NS structures.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics