NMR probe of metallic states in nanoscale topological insulators

Dimitrios Koumoulis, Thomas C. Chasapis, Robert E. Taylor, Michael P. Lake, Danny King, Nanette N. Jarenwattananon, Gregory A. Fiete, Mercouri G. Kanatzidis, Louis S. Bouchard

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36 Citations (Scopus)

Abstract

A Te125 NMR study of bismuth telluride nanoparticles as a function of particle size revealed that the spin-lattice relaxation is enhanced below 33 nm, accompanied by a transition of NMR spectra from the single to the bimodal regime. The satellite peak features a negative Knight shift and higher relaxivity, consistent with core polarization from p-band carriers. Whereas nanocrystals follow a Korringa law in the range 140-420 K, micrometer particles do so only below 200 K. The results reveal increased metallicity of these nanoscale topological insulators in the limit of higher surface-to-volume ratios.

Original languageEnglish
Article number026602
JournalPhysical review letters
Volume110
Issue number2
DOIs
Publication statusPublished - Jan 9 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Koumoulis, D., Chasapis, T. C., Taylor, R. E., Lake, M. P., King, D., Jarenwattananon, N. N., Fiete, G. A., Kanatzidis, M. G., & Bouchard, L. S. (2013). NMR probe of metallic states in nanoscale topological insulators. Physical review letters, 110(2), [026602]. https://doi.org/10.1103/PhysRevLett.110.026602