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Design and Operation of Stable rf‐Biased Superconducting Point‐Contact Quantum Devices, and a Note on the Properties of Perfectly Clean Metal Contacts
Point‐contact devices are described which have exhibited long‐term stability and reliability. A particular mode of operation of the devices as rf‐biased low‐frequency detectors is described in… Expand
QUANTUM STATES AND TRANSITIONS IN WEAKLY CONNECTED SUPERCONDUCTING RINGS.
MAGNETOCARDIOGRAMS TAKEN INSIDE A SHIELDED ROOM WITH A SUPERCONDUCTING POINT‐CONTACT MAGNETOMETER
A point‐contact (SQUID) magnetometer was used inside a shielded room to record the magnetic field of the human heart, without noise‐averaging. The resulting magnetocardiograms, with the peak signal… Expand
Macroscopic Quantum Interference Effects through Superconducting Point Contacts
A small-area contact between two pieces of superconducting metal or alloy is a remarkably sensitive and convenient device for demonstrating long-range quantum interference effects. It has been shown… Expand
A Comparison of Three Types of Pulse Tube Refrigerators: New Methods for Reaching 60K
Pulse tube or thermoacoustic refrigerators require only one moving part—an oscillating piston or diaphragm at room temperature. Refrigeration occurs within a tube connected to the pressure wave… Expand
MINIATURE ULTRASENSITIVE SUPERCONDUCTING MAGNETIC GRADIOMETER AND ITS USE IN CARDIOGRAPHY AND OTHER APPLICATIONS.
A portable magnetic gradiometer was built using an rf‐biased point contact device as a sensor and a superconducting flux transformer 2.5 cm in diameter by 10 cm long to couple to the gradient of the… Expand
Sensitivity Enhancement of Superconducting Quantum Interference Devices through the Use of Fractional‐Turn Loops
- J. Zimmerman
- 1 October 1971
A new ``fractional‐turn'' configuration for superconducting quantum interference devices provides enhanced sensitivity, with large loop area and low loop inductance. By operating the new… Expand
NOISE THERMOMETRY WITH THE JOSEPHSON EFFECT.
Thermal noise causes a random frequency modulation of the self‐oscillation of a Josephson junction, and the temperature of the noise source can be determined by analysis of the generated signal. We… Expand
Construction and Performance of Wire-Junction RF-SQUIDs
Two-hole symmetric rf-SQUID’s were made by using a pair of wire segments to form the point contact Josephson junction. The SQUID’s are reliable, easy to make and to adjust, and have a sensitivity of… Expand