Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.026602
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Funding
- DARPA (MTO) MESO
- AFOSR/DARPA (DSO) QuASAR
- ARO [W911NF-09-1-0527]
- NSF [DMR-0955778]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [955778] Funding Source: National Science Foundation
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A Te-125 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. DOI: 10.1103/PhysRevLett.110.026602
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