Abstract/Details

Localization in two dimensional third sound systems


2004 2004

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Abstract (summary)

The results of third sound and quartz crystal microbalance measurements on thin superfluid 4He films (4–16 atomic layers) exploring the effect of surface roughness, disorder and localization are reported. The effect of surface roughness on 4He adsorption and third sound speed is studied in detail for several well parameterized CaF2 surfaces. The third sound velocity and the 4He adsorption on CaF2 both show a hysteretic behavior with the adding and removing of 4He. Adsorption to the CaF2 can be as much as ten times larger than on similar smooth surfaces and the third sound travelling on this thicker 4He film propagates up to three times slower.

Substrates are fabricated that contain two-dimensional random and ordered collections of disk shaped CaF2 regions on an otherwise smooth background. The difference in the third sound speed and 4He adsorption on the two regions causes the CaF2 regions to act as third sound scatterers. The frequency dependence of the third sound propagation through the arrays is reported: pass bands and band gaps are observed on the ordered array and classical wave localization effects are observed on the disordered array.

Indexing (details)


Subject
Condensation
Classification
0611: Condensation
Identifier / keyword
Pure sciences, Calcium fluoride, Helium, Microbalance, Quartz crystal, Superfluids, Third sound
Title
Localization in two dimensional third sound systems
Author
Herrmann, Justin
Number of pages
186
Publication year
2004
Degree date
2004
School code
0118
Source
DAI-B 65/01, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Hallock, Robert B.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3118305
ProQuest document ID
305177809
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305177809
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