The pressure dependence of the superconducting transition temperature Tc of vanadium (∂Tc∂P=11±3×10^-6 ^∘{}K bar^-1) and niobium (∂Tc∂P=0±3×10^-6 ^∘{}K bar^-1) has been studied up to a maximum pressure of 10 kbar. The observed values are compared with values calculated from calorimetric and thermal-expansion data. A possible explanation of the observed variation in the sign of the pressure dependence of Tc in the transition-metal superconductors is offered.
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Gardner et al. (1966) studied this question.
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