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NMR Probe of Metallic States in Nanoscale Topological Insulators

A 125Te NMR study of bismuth telluride nanoparticles as function of particle size revealed that the spin-lattice relaxation is enhanced below 33 nm, accompanied by a transition of NMR spectra from single to 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 140-420K, micrometer particles do so only below 200K. The results reveal increased metallicity of these nanoscale topological insulators in the limit of higher surface-to-volume ratios.

preprint2013arXivOpen access
Dimitrios KoumoulisThomas C. ChasapisRobert E. TaylorMichael P. LakeDanny KingNanette N. JarenwattananonGregory A. FieteMercouri G. KanatzidisLouis-S. Bouchard
cond-mat.mes-hallcond-mat.mtrl-sci
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Dimitrios KoumoulisThomas C. ChasapisRobert E. TaylorMichael P. LakeDanny KingNanette N. JarenwattananonGregory A. FieteMercouri G. KanatzidisLouis-S. Bouchard

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