Properties of low-resistivity superconducting niobium contacts
The static and hf properties of low-resistance (R/sub N/<1 ..cap omega..) superconducting niobium point contacts were investigated at 4.2 /sup 0/K. Microwave radiation induced steps of the current in the I--V characteristics of these point contacts. The height of the steps was explained satisfactorily by a model of a contact subjected to a bias voltage when allowance was made for the self-interaction of the Josephson radiation. In the case of low-resistivity contacts characterized by a high value of the critical current (I/sub c/ = 10--60 mA) the hf limit was governed primarily by the value of I/sub c/. The form of the I--V characteristics obtained in the absence of microwave radiation differed from the hyperbolic curve predicted by the resistive model of a contact. A voltage jump at a constant current observed in the initial parts of the characteristics was attributed to the influence of the radiation emitted by the contact itself. Beats (of 60 MHz frequency) between the microwave and Josephson radiations were observed in the contacts.
- Research Organization:
- P. N. Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
- OSTI ID:
- 5289172
- Journal Information:
- Sov. Phys. - Solid State (Engl. Transl.); (United States), Journal Name: Sov. Phys. - Solid State (Engl. Transl.); (United States) Vol. 24:1; ISSN SPSSA
- Country of Publication:
- United States
- Language:
- English
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360603* -- Materials-- Properties
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CONTACTS
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELEMENTS
EQUIPMENT
FLUCTUATIONS
METALS
MICROWAVE RADIATION
NIOBIUM
PHYSICAL PROPERTIES
RADIATIONS
SUPERCONDUCTORS
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
VARIATIONS
WAVE PROPAGATION