Topological insulator Bi2Se3 has shown a number of interesting physical properties. Doping Bi2Se3 with copper or strontium has been demonstrated to make the material superconducting and potentially even a topological superconductor. The recent discovery of superconducting niobium-doped Bi2Se3 reveals an exciting new physical phenomenon, the coexistence of superconductivity and magnetic ordering, as well as signatures of an odd-parity p-wave superconducting order. To understand this new phenomenon, a detailed knowledge of the electronic structure is needed. We present an observation of quantum oscillations in the magnetization (the de Haas-van Alphen effect) of Nb-doped Bi2Se3. In the fully superconducting crystal, two distinct orbits are observed, in sharp contrast to Bi2Se3, Cu-doped Bi2Se3, and Sr-doped Bi2Se3. The multiple frequencies observed in our quantum oscillations, combined with our electrical transport studies, indicate the multi-orbit nature of the electronic state of Nb-doped Bi2Se3.
B. J. Lawson and P. Corbae and G. Li and F. Yu and T. Asaba and C. Tinsman and Y. Qiu and J. E. Medvedeva and Y. S. Hor and L. Li, "Multiple Fermi Surfaces in Superconducting Nb-Doped Bi₂Se₃," Physical review B: Condensed matter and materials physics, vol. 94, no. 4, American Physical Society (APS), Jul 2016.
The definitive version is available at https://doi.org/10.1103/PhysRevB.94.041114
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01 Jul 2016