Measuring the dependence of weight on temperature in the low-temperature regime using a magnetic suspension balance

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A novel set-up was developed that allows us to cool samples close to liquid helium temperatures, measure their exact temperature and determine their weight in a buoyancy-free environment along a wide temperature range using a magnetic suspension balance. This allows for the first time to accurately determine the weight of both high-T-c (BSCCO and YBCO) and low-T-c (Nb) superconductors during their phase transition. Our data allow us to put limits on possible weight changes over temperature (alpha < 2 x 10(-8) K-1 for copper) as well as violations of the weak equivalence principle for superconductors while passing their critical temperature (eta < 2 x 10(-3)).
Publisher
IOP PUBLISHING LTD
Issue Date
2010-01
Language
English
Article Type
Article
Keywords

COOPER-PAIR MASS; EQUIVALENCE PRINCIPLE; GRAVITY; NIOBIUM; TESTS; RANGE

Citation

MEASUREMENT SCIENCE TECHNOLOGY, v.21, no.1

ISSN
0957-0233
DOI
10.1088/0957-0233/21/1/015111
URI
http://hdl.handle.net/10203/100198
Appears in Collection
ME-Journal Papers(저널논문)
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