Compensation of the paramagnetic effect on Hc2by magnetic moments: 700 kG superconductors

Abstract
An increase of about 50-100 kG of the upper critical field is observed in Sn1.2(1-x)EuxMo6.35S8 and Pb1-xEux- Mo6.35S8 with respect to the compounds without Eu. This increase, due to the Jaccarino-Peter compensation effect, pushes Hc2 up into the vicinity of 700 kG.

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