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 language | English |
|---|---|
| Article number | 026602 |
| Journal | Physical Review Letters |
| Volume | 110 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jan 9 2013 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
NMR probe of metallic states in nanoscale topological insulators. / Koumoulis, Dimitrios; Chasapis, Thomas C.; Taylor, Robert E.; Lake, Michael P.; King, Danny; Jarenwattananon, Nanette N.; Fiete, Gregory A.; Kanatzidis, Mercouri G; Bouchard, Louis S.
In: Physical Review Letters, Vol. 110, No. 2, 026602, 09.01.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - NMR probe of metallic states in nanoscale topological insulators
AU - Koumoulis, Dimitrios
AU - Chasapis, Thomas C.
AU - Taylor, Robert E.
AU - Lake, Michael P.
AU - King, Danny
AU - Jarenwattananon, Nanette N.
AU - Fiete, Gregory A.
AU - Kanatzidis, Mercouri G
AU - Bouchard, Louis S.
PY - 2013/1/9
Y1 - 2013/1/9
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.110.026602
DO - 10.1103/PhysRevLett.110.026602
M3 - Article
VL - 110
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 2
M1 - 026602
ER -