Journal
PHYSICAL REVIEW B
Volume 94, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.041114
Keywords
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Funding
- Office of Naval Research [N00014-15-1-2382]
- National Science Foundation [ECCS-1307744, DMR-1255607, DMR-1428226, F031543]
- Department of Energy [DE-SC0008110]
- NSF [DMR-084173]
- State of Florida
- DOE
- U.S. Department of Energy (DOE) [DE-SC0008110] Funding Source: U.S. Department of Energy (DOE)
- Directorate For Engineering [1307744] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1255607, 1428226] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1307744] Funding Source: National Science Foundation
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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.
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