Low Temperature Physics: 38, 341 (2012); https://doi.org/10.1063/1.3699955 (4 pages)
Quantization of diamagnetic current in a superconducting ring with Josephson point contact
S.I. Bondarenko, V.P. Koverya, A.V. Krevsun, and N.M. Levchenko
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Received Octouber 10, 2011
It is experimentally established, that the critical value of diamagnetic current excited by an external magnetic field in a superconducting ring (inductance ~ 10–6 H) with a Nb–Nb clamping point contact, possessing the Josephson contact properties, is a strictly periodic function of field, despite the complex microstructure of the clamping contact. The reasons of the periodic dependence are discussed on the basis of the model of interference of diamagnetic current and quantum values of circulating current in the microinterferometer, formed by the clamping contact.
PACS: 74.25.Ha Magnetic properties including vortex structures and related phenomena;
Key words: superconductivity, ring, quantization, magnetic field, point contact.