Abstract
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-Tc (BSCCO and YBCO) and low-Tc (Nb) superconductors during their phase transition. Our data allow us to put limits on possible weight changes over temperature (α < 2 × 10−8 K−1 for copper) as well as violations of the weak equivalence principle for superconductors while passing their critical temperature (η < 2 × 10−3).
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