The critical field for Niobium Calculate the transition temperature .
Niobium is a type-II superconductor that exhibits superconductivity below a certain critical temperature, denoted as $T_c$. The critical field, $H_c$, is the maximum magnetic field strength at which niobium can remain in the superconducting state. For type-II superconductors like ________ ____ ________ _____ ____ _______.
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