Diamagnetism due to fluctuations in superconductors
Fluctuations of the order parameter above T/sub c/ in superconductors give rise to a small diamagnetism, comparable in magnitude to the Landau diamagnetism. An extremely sensitive magnetometer system was devised to measure this small temperature-dependent diamagnetism. A superconducting quantum interference device coupled to the sample was used as a magnetic flux detector. The sample temperature could be varied continuously between 2 to 16/sup 0/K while magnetization changes as small as 10/sup 8/G were resolved. Extensive measurements have been performed on bulk single crystals of three materials: indium, lead, and type II lead-thallium alloys. Each of these materials shows a temperature-dependent diamagnetism which is qualitatively described by Prange's calculation for small applied fields. Results are discussed.
- Research Organization:
- Harvard Univ., Cambridge, Mass. (USA). Div. of Engineering and Applied Physics
- OSTI ID:
- 7197097
- Report Number(s):
- AD-713242; TR-3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fluctuation diamagnetism near surfaces and twinning planes in superconductors
Breakdown of the Ginzburg-Landau approximation in superconductor fluctuation theory
Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
DIAMAGNETISM
ELECTRONIC EQUIPMENT
ELEMENTS
FLUXMETERS
INDIUM
LEAD
LEAD ALLOYS
MAGNETISM
MAGNETOMETERS
MEASURING INSTRUMENTS
METALS
MICROWAVE EQUIPMENT
PHYSICAL PROPERTIES
SQUID DEVICES
SUPERCONDUCTING DEVICES
THALLIUM ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE