Abstract
We have measured superconducting ${T}_{c}$ using a highly sensitive magnetic susceptibility technique to megabar pressures $(>100\mathrm{GPa})$. We observed anomalies in ${T}_{c}(P)$ for Nb at 5--6 GPa and 60--70 GPa, at which pressure ${T}_{c}$ increases by 0.7 K and decreases by about 1 K, respectively. In contrast, ${T}_{c}$ in Ta remains nearly constant up to 45 GPa. We suggest that the anomalies in Nb arise from stress-sensitive electronic topological transitions. Between 70 and 132 GPa, ${T}_{c}$ for Nb drops continuously to 4.7 K, which is related to the decrease in density of states at the Fermi level with increasing pressure.
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