Switch useful at superconducting temperatures and comprising superconducting material

US6184765A · kind A · utility

Assignees

• NEC Research Institute, Inc. · US
• TATA INSTITUTE OF FUNDAMENTAL RESEARCH · IN
• TPPED (Technical Pyhsics & Prototype Engineering Division) · IN

Inventors

• Sabyasachi Bhattacharya · Somerville, US
• Mark J. Higgins · Cranbury, US
• Satyajit S. Banerjee · Mumbai, IN
• Nitin N Patil · Kolhapur, IN
• Srinivasan Ramakrishnan · Mumbai, IN
• Arun K. Grover · Mumbai, IN
• Chandrasekhar V.R. Turumella · Mumbai, IN
• Vinod Chandra Sahni · Indore, IN
• Gurazada Ravikumar · Mumbai, IN
• Prashant K. Mishra · Mumbai, IN

Key dates

• Filing date: Jan 7, 1999
• Grant date: Feb 6, 2001
• Expiry date: Jan 7, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S505/86

Abstract

The present invention is directed, inter alia, to a switch comprising: PA1 (A) a superconducting material whose field cooled and zero field cooled ac permittivities differ from each other, and whose field cooled and zero field cooled ac susceptibilities differ from each other, in a range of temperature below the superconducting transition temperature of the material; PA1 (B) means for applying a static magnetic field to said material; PA1 (C) means for controllably applying to said material an oscillating magnetic field of a magnitude effective to convert said material from a state exhibiting filed cooled permittivity to a state exhibiting zero field cooled permittivity; and PA1 (D) means for applying to said material a heat pulse effective to convert said material from a state exhibiting zero field cooled permittivity to a state exhibiting field cooled permittivity, said switch operating between a superconducting zero field cooled state and a superconducting field cooled state. PA1 The present invention is also directed, inter alia, to a method of making such a switch.