Title

The Hall Effect in Doped Bi₂Se₃ Superconductors

Presenter Information

Rachel Birchmier

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

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Apr 17th, 9:00 AM Apr 17th, 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