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Magnetic properties of free metal cl...

Jiang, Wei.

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Magnetic properties of free metal clusters.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Magnetic properties of free metal clusters./
Author:	Jiang, Wei.
Description:	108 p.
Notes:	Adviser: Louis A. Bloomfield.
Contained By:	Dissertation Abstracts International69-01B.
Subject:	Physics, Atomic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3300243
ISBN:	9780549447290

Magnetic properties of free metal clusters.
Jiang, Wei.

Magnetic properties of free metal clusters. - 108 p.

Adviser: Louis A. Bloomfield.

Thesis (Ph.D.)--University of Virginia, 2008.

In this dissertation, results of Stern-Gerlach type magnetic deflection experiments on Chromium, Iron, and Aluminum clusters consisting of &sim;20-200 atoms are reported. These metal clusters were produced using a laser vaporization technique in helium, and their beams were formed using supersonic expansion into vacuum. Measurements of their magnetic deflections were conducted at temperature ranging from 50K to 250K and at various magnetic field strengths. Both Chromium and Iron clusters are found to behave in accordance with a superparamagnetic model and to have enhanced magnetism compared to their bulks. For Chromium clusters with N≥34, each cluster has at least two isomers with distinguishable magnetic moments at low temperatures. For Iron clusters with Tvib=55 K, some deviations from the superparamagnetic model were observed. Aluminum clusters with odd numbers of atoms exhibit paramagnetic properties at low temperatures, which are believed to be related to superconductivity. At temperatures as low as 55K, the predicted large diamagnetism of Al56 due to superconductivity was not observed, within our system's resolution.

ISBN: 9780549447290Subjects--Topical Terms:

1029235
Physics, Atomic.

Magnetic properties of free metal clusters.
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020 $a 9780549447290
035 $a (UMI)AAI3300243
035 $a AAI3300243
040 $a UMI $c UMI
100 1 $a Jiang, Wei. $3 1285555
245 1 0 $a Magnetic properties of free metal clusters.
300 $a 108 p.
500 $a Adviser: Louis A. Bloomfield.
500 $a Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0367.
502 $a Thesis (Ph.D.)--University of Virginia, 2008.
520 $a In this dissertation, results of Stern-Gerlach type magnetic deflection experiments on Chromium, Iron, and Aluminum clusters consisting of &sim;20-200 atoms are reported. These metal clusters were produced using a laser vaporization technique in helium, and their beams were formed using supersonic expansion into vacuum. Measurements of their magnetic deflections were conducted at temperature ranging from 50K to 250K and at various magnetic field strengths. Both Chromium and Iron clusters are found to behave in accordance with a superparamagnetic model and to have enhanced magnetism compared to their bulks. For Chromium clusters with N≥34, each cluster has at least two isomers with distinguishable magnetic moments at low temperatures. For Iron clusters with Tvib=55 K, some deviations from the superparamagnetic model were observed. Aluminum clusters with odd numbers of atoms exhibit paramagnetic properties at low temperatures, which are believed to be related to superconductivity. At temperatures as low as 55K, the predicted large diamagnetism of Al56 due to superconductivity was not observed, within our system's resolution.
590 $a School code: 0246.
650 4 $a Physics, Atomic. $3 1029235
650 4 $a Physics, Molecular. $3 1018648
690 $a 0609
690 $a 0748
710 2 $a University of Virginia. $3 645578
773 0 $t Dissertation Abstracts International $g 69-01B.
790 $a 0246
790 1 0 $a Bloomfield, Louis A., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3300243