Large Magnetoresistance and Nontrivial Berry Phase in Nb3Sb Crystals with A15 Structure
arXiv:2107.14689 · doi:10.1088/0256-307X/38/8/087501
Abstract
Compounds with the A15 structure have attracted extensive attention due to their superconductivity and nontrivial topological band structure. We have successfully grown NbSb single crystals with a A15 structure and systematically measured the longitudinal resistivity, Hall resistivity and quantum oscillations in magnetization. Similar to other topological trivial/nontrivial semimetals, NbSb, exhibits large magnetoresistance (MR) at low temperatures (717, 2 K and 9 T), unsaturating quadratic field dependence of MR and up-turn behavior in (\emph{T}) curves under magnetic field, which is considered to result from a perfect hole-electron compensation, as evidenced by the Hall resistivity measurements. The nonzero Berry phase obtained from the de-Hass van Alphen (dHvA) oscillations demonstrates that NbSb is topologically nontrivial. These results indicate that NbSb superconductor is also a semimetal with large MR and nontrivial Berry phase, indicating that NbSb may be another platform to search for Majorana zero-energy mode.
arXiv comment5 pages, 5 figures. arXiv admin note: text overlap with arXiv:2007.04814, arXiv:2104.03799
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