The Hall Effect in Doped Bi₂Se₃ Superconductors
Department
Physics
Major
Physics
Research Advisor
Hor, Yew San
Advisor's Department
Physics
Funding Source
OURE Missouri S&T
Abstract
The topological insulator Bi2Se3 has been known to undergo a superconducting transition at tc=3.8K when doped with copper or niobium. When doped with 0.25 moles of copper or niobium for each mole of Bi2Se3, the metal atoms are inserted in the van der Waals gaps between layers of Bi2Se3. These crystals are formed by combining raw materials stoichiometrically followed by a sequence of melting, cooling, and quenching. Their resistivity is tested approaching their critical temperature to check for superconductivity. If superconductivity is achieved the Hall voltage of the crystal is measured to check for unique magnetic properties. The results of this experiment are important for finding the optimum doping amount and growth technique for superconducting 3D topological insulators such as Cu0.25Bi2Se3 and Nb0.25Bi2Se3. The presence of the Hall Effect under a magnetic field and superconductivity suggests the presence of exotic particles and magnetic moments, making these materials of interest in quantum computing
Biography
Rachel Birchmier is a senior majoring in Physics and minoring in Mathematics, Computer Science, and Spanish. She is interested in experimental physics research especially in the field of condensed matter physics research.
Research Category
Sciences
Presentation Type
Poster Presentation
Document Type
Poster
Location
Upper Atrium
Presentation Date
17 Apr 2018, 9:00 am - 12:00 pm
The Hall Effect in Doped Bi₂Se₃ Superconductors
Upper Atrium
The topological insulator Bi2Se3 has been known to undergo a superconducting transition at tc=3.8K when doped with copper or niobium. When doped with 0.25 moles of copper or niobium for each mole of Bi2Se3, the metal atoms are inserted in the van der Waals gaps between layers of Bi2Se3. These crystals are formed by combining raw materials stoichiometrically followed by a sequence of melting, cooling, and quenching. Their resistivity is tested approaching their critical temperature to check for superconductivity. If superconductivity is achieved the Hall voltage of the crystal is measured to check for unique magnetic properties. The results of this experiment are important for finding the optimum doping amount and growth technique for superconducting 3D topological insulators such as Cu0.25Bi2Se3 and Nb0.25Bi2Se3. The presence of the Hall Effect under a magnetic field and superconductivity suggests the presence of exotic particles and magnetic moments, making these materials of interest in quantum computing
