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Compounds with the A15 structure have attracted extensive attention due totheir superconductivity and nontrivial topological band structure. We havesuccessfully grown Nb$_3$Sb single crystals with a A15 structure andsystematically measured the longitudinal resistivity, Hall resistivity andquantum oscillations in magnetization. Similar to other topologicaltrivial/nontrivial semimetals, Nb$_3$Sb, exhibits large magnetoresistance (MR)at low temperatures (717$\%$, 2 K and 9 T), unsaturating quadratic fielddependence of MR and up-turn behavior in $\rho_{xx}$(\emph{T}) curves undermagnetic field, which is considered to result from a perfect hole-electroncompensation, as evidenced by the Hall resistivity measurements. The nonzeroBerry phase obtained from the de-Hass van Alphen (dHvA) oscillationsdemonstrates that Nb$_3$Sb is topologically nontrivial. These results indicatethat Nb$_{3}$Sb superconductor is also a semimetal with large MR and nontrivialBerry phase, indicating that Nb$_{3}$Sb may be another platform to search forMajorana zero-energy mode.

Large Magnetoresistance and Nontrivial Berry Phase in Nb3Sb Crystals with A15 Structure