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Voltage Controlled Superconducting Switch

IP.com Disclosure Number: IPCOM000090203D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Harris, EP: AUTHOR [+2]

Abstract

The voltage-controlled superconducting switch includes layers of super super-conducting, semiconducting, insulating and conducting material successively deposited on a substrate. The upper conducting layer serves as a metal electrode. Control voltages are applied between this electrode and the semiconductor. When a voltage is applied, the semiconductor is negatively charged and the number of electrons in the semiconductor is increased. This modifies the proximity effect between the semiconductor and superconductor and lowers its critical temperature to a value Tcv below the value Tco in the absence of an applied voltage. When operated at a temperature between Tcv and Tco, the voltage is controlled to switch the superconductor between superconducting and normal states.

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Voltage Controlled Superconducting Switch

The voltage-controlled superconducting switch includes layers of super super-conducting, semiconducting, insulating and conducting material successively deposited on a substrate. The upper conducting layer serves as a metal electrode. Control voltages are applied between this electrode and the semiconductor. When a voltage is applied, the semiconductor is negatively charged and the number of electrons in the semiconductor is increased. This modifies the proximity effect between the semiconductor and superconductor and lowers its critical temperature to a value Tcv below the value Tco in the absence of an applied voltage. When operated at a temperature between Tcv and Tco, the voltage is controlled to switch the superconductor between superconducting and normal states. The semiconducting and superconducting layers are on the order of 100 to 1000 Angstroms thick. The insulating layer can be replaced by a Schottky barrier at the metal-semiconductor interface. The superconductor and semiconductor have a thickness less than the coherence length which is a measure of the distance over which long range order exists in the superconductor.

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