4 papers
Mixed valency and site-preference chemistry for Cerium and its compounds: A predictive DFT study
Aftab Alam, D D Johnson
Cerium and its technologically relevant compounds are examples of anomalous mixed valency, originating from two competing oxidation states -- itinerant Ce and localized Ce$^…
Low-energy, planar magnetic defects in BaFe2As2: nanotwins, twins, antiphase and domain boundaries
S. N. Khan, Aftab Alam, D. D. Johnson
In BaFe2As2, structural and magnetic planar defects begin to proliferate below the structural phase transition, affecting descriptions of magnetism and superconductivity. We study…
Reversible tuning of the surface state in a psuedo-binary Bi2(Te-Se)3 topological insulator
Rui Jiang, Lin-Lin Wang, Mianliang Huang +4
We use angle-resolved photoemission spectroscopy to study non-trivial surface state in psuedobinary Bi2Se0.6Te2.3 topological insulator. We show that unlike previously studied bina…
Ternary Tetradymite Compounds as Topological Insulators
Lin-Lin Wang, Duane D. Johnson
Ternary tetradymites Bi2Te2S, Bi2Te2Se and Bi2Se2Te are found to be stable, bulk topological insulators via theory, showing band inversion between group V and VI pz orbitals. We id…