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Superconductivity in colloidal lead ...

Zolotavin, Pavlo.

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Superconductivity in colloidal lead nanocrystals.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Superconductivity in colloidal lead nanocrystals./
Author:	Zolotavin, Pavlo.
Description:	164 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.
Contained By:	Dissertation Abstracts International74-10B(E).
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3568445
ISBN:	9781303229404

Superconductivity in colloidal lead nanocrystals.
Zolotavin, Pavlo.

Superconductivity in colloidal lead nanocrystals. - 164 p.

Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.

Thesis (Ph.D.)--The University of Chicago, 2013.

Monodisperse colloidal lead nanoparticles with diameters ranging from 4.4 to 20 nm were prepared by a self-limiting growth method. The nanoparticles are protected from oxidation by an amorphous lead-tin oxide shell of 1.5-2 nm thickness. The magnetic susceptibility of the particles was measured as a function of size, temperature and magnetic field. The Meissner effect was 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 to 140 times. The coupling between particles was in situ controlled through the conversion of the oxides present on the surface of the nanoparticles to chalcogenides. This transformation allows for a 109-fold increase in the conductivity. The temperature of the onset of the superconductivity was found to depend upon the degree of coupling of the nanoparticles in the vicinity of the insulator - superconductor transition. The critical current density of the best sample of Pb/PbSe nanocrystals at zero magnetic field was determined to be 4 x 103 A/cm 2. In turn, the critical field of the sample shows 50-fold enhancement compared to bulk Pb. A method to convert the original Pb/PbO nanocrystals into colloidal Pb/PbS (Se, Te) particle was developed. This alleviates the necessity of chemical post processing and provides a truly colloidal superconductor. Paramagnetic Meissner effect of abnormally large amplitude is observed for Pb/PbTe nanocrystal assemblies. The material described in this manuscript is the first nanostructured superconductor prepared by the bottom-up approach starting from colloidal nanoparticles.

ISBN: 9781303229404Subjects--Topical Terms:

560527
Chemistry, Physical.

Superconductivity in colloidal lead nanocrystals.
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100 1 $a Zolotavin, Pavlo. $3 2094952
245 1 0 $a Superconductivity in colloidal lead nanocrystals.
300 $a 164 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.
500 $a Adviser: Philippe Guyot-Sionnest.
502 $a Thesis (Ph.D.)--The University of Chicago, 2013.
520 $a Monodisperse colloidal lead nanoparticles with diameters ranging from 4.4 to 20 nm were prepared by a self-limiting growth method. The nanoparticles are protected from oxidation by an amorphous lead-tin oxide shell of 1.5-2 nm thickness. The magnetic susceptibility of the particles was measured as a function of size, temperature and magnetic field. The Meissner effect was 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 to 140 times. The coupling between particles was in situ controlled through the conversion of the oxides present on the surface of the nanoparticles to chalcogenides. This transformation allows for a 109-fold increase in the conductivity. The temperature of the onset of the superconductivity was found to depend upon the degree of coupling of the nanoparticles in the vicinity of the insulator - superconductor transition. The critical current density of the best sample of Pb/PbSe nanocrystals at zero magnetic field was determined to be 4 x 103 A/cm 2. In turn, the critical field of the sample shows 50-fold enhancement compared to bulk Pb. A method to convert the original Pb/PbO nanocrystals into colloidal Pb/PbS (Se, Te) particle was developed. This alleviates the necessity of chemical post processing and provides a truly colloidal superconductor. Paramagnetic Meissner effect of abnormally large amplitude is observed for Pb/PbTe nanocrystal assemblies. The material described in this manuscript is the first nanostructured superconductor prepared by the bottom-up approach starting from colloidal nanoparticles.
590 $a School code: 0330.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Physics, Low Temperature. $3 1669075
650 4 $a Nanoscience. $3 587832
690 $a 0494
690 $a 0598
690 $a 0565
710 2 $a The University of Chicago. $b Chemistry. $3 1675066
773 0 $t Dissertation Abstracts International $g 74-10B(E).
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791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3568445