Browse Prior Art Database

Stable Resistors for Superconductive Devices

IP.com Disclosure Number: IPCOM000050421D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Grebe, KR: AUTHOR

Abstract

In superconductive circuitry, and particularly Josephson device circuits, resistors are required which are stable and impervious to time, temperature, and chemical variations. Since most resistors will change in value from room temperature to liquid helium temperatures, and since this change is not necessarily linear, it becomes very difficult to fabricate a resistor with a desired value at the temperature of circuit operation. In order to solve these problems, a specific group of compounds is described that are fabricated by codeposition of the elements at temperatures below the reaction point of the elements, to form a disturbed structure. This structure has resistance properties which exhibit little or no change with temperature.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Stable Resistors for Superconductive Devices

In superconductive circuitry, and particularly Josephson device circuits, resistors are required which are stable and impervious to time, temperature, and chemical variations. Since most resistors will change in value from room temperature to liquid helium temperatures, and since this change is not necessarily linear, it becomes very difficult to fabricate a resistor with a desired value at the temperature of circuit operation. In order to solve these problems, a specific group of compounds is described that are fabricated by codeposition of the elements at temperatures below the reaction point of the elements, to form a disturbed structure. This structure has resistance properties which exhibit little or no change with temperature.

Nb-Au and Nb-Pt structures provide satisfactory resistors during thermal cycling. These structures also show little difference in resistive properties when the Au or Pt proportions are changed. Trimming of the resistors made by this technique varies directly proportionally to the thickness of the resistor. In particular, the following structures provided good resistors: Nb(3)Au 3,200 angstroms thick

Nb(3)Au(2) 1,600 angstroms thick

Nb(3)Pt 3,100 angstroms thick

Nb(3)Pt(2) 1,350 angstroms thick.

1