Journal
ACS NANO
Volume 4, Issue 10, Pages 5599-5608Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn102009g
Keywords
superconductivity; grains; Meissner effect; magnetic susceptibility; critical field; transition temperature; monodisperse; metal nanoparticles; lead; colloidal; oxidation; core-shell
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- University of Chicago MRSEC NSF-DMR [DMR-0213745]
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Monodisperse colloidal lead nanoparticles with diameters ranging from 4.4 to 20 nm are prepared by a self-limiting growth method. The nanoparticles are monodispersed and protected from oxidation by an amorphous tin-lead oxide shell of 1.5-2 nm thickness. The magnetic susceptibility of the particles is measured as a function of size, temperature, and magnetic field. The Meissner effect is observed indicating the superconducting transition. For the 20 and 16 nm particles, the critical temperature is suppressed to 6.9 K from the bulk value of 7.2 K and is further reduced for smaller particles. Depending on the size of the particles, the critical field is enhanced by 60-140 times. The superconducting properties agree closely with the theoretical expectations.
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