Bauer, A. and Bentner, J. and Aprili, M. and Della Rocca, M. and Strunk, C. (2007) Half-integer flux quantization in a superconducting loop with a ferromagnetic pi-junction. JOURNAL OF LOW TEMPERATURE PHYSICS, 147 (3-4). pp. 431-439. ISSN 0022-2291, 1573-7357
Full text not available from this repository. (Request a copy)Abstract
Superconducting loops containing a pi-junction are predicted to show a spontaneous magnetic moment in zero external magnetic field. In order to confirm this longstanding prediction experimentally, we performed magnetization measurements on individual mesoscopic superconducting niobium loops with a ferromagnetic (PdNi) pi-junction. The loops are prepared on top of the active area of a micro Hall-sensor based on high mobility GaAs/AlGaAs heterostructures. We observe switching of the loop between different magnetization states at very low-magnetic fields, which is asymmetric for positive and negative sweep direction. This is evidence for a spontaneous current induced by the intrinsic phase shift of the pi-junction. In addition, the presence of the spontaneous current at zero applied field is directly revealed by an increase of the magnetic moment with decreasing temperature, which results in a half integer flux quantization in the loop at low temperatures.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Dec 2020 12:23 |
| Last Modified: | 04 Dec 2020 12:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32835 |
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