Bulletin of the American Physical Society
2006 Ohio Section of the APS Fall Meeting
Friday–Saturday, October 13–14, 2006; Orrville, Ohio
Session E1: Thin Films |
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Chair: Sasa Dordevic, The University of Akron Room: Wayne College A107 |
Saturday, October 14, 2006 10:25AM - 10:37AM |
E1.00001: ABSTRACT WITHDRAWN |
Saturday, October 14, 2006 10:37AM - 10:49AM |
E1.00002: Technique for Measurement of Inter-Phase Line Tension in Langmuir Films Lu Zou, Jacob M. Pugh, Elizabeth K. Mann, Andrew J. Bernoff, James C. Alexander, J. Adin Mann, Jr. Line tension, the free energy per unit length associated with the line boundary, controls properties such as size and shape of surface domains. It plays an important role in two-dimensional surface phases. It has been extremely difficult to measure this parameter to better than +/-20{\%}. We made a model of the fluid dynamics governing the relaxation of phase domains in Langmuir Films and implemented a numerical solution. Experimentally, a four-roll mill provided symmetric shear forces about a central stagnation point on the 8CB multilayers sitting at air/water interface. 8CB domains were stretched into bola shape and then performed relaxations. We compared relaxations observed with a Brewster-angle microscope to the simulated ones and deduced the line tension driving the relaxation from this comparison. In this way, the relative standard deviation could be remarkably reduced to $<$ 5{\%}. [Preview Abstract] |
Saturday, October 14, 2006 10:49AM - 11:01AM |
E1.00003: Combinatorial Hall Effect System for Oxide Films Bryan Kerns, David Rench, Michael Schroer, Tiffani Casper, Jeffrey Clayhold, Ivan Bozovic Combinatorial film growth techniques have made it possible to produce large numbers of high-quality oxide films at one time. Characterizing the samples by traditional methods would be far too slow. Certain measurements, such as the Hall effect, require careful temperature control and lock-in amplifiers to resolve the small signal. We have just built a complete system for measuring the Hall effect in 32 samples simultaneously. The system consists of our home-built, 32-channel lock-in amplifier system, a gas-flow cryostat with a pogo-pin array, a 1 Tesla electromagnet, computerized data acquisition and temperature control, and a specially-built multiplexer to reconfigure the sample leads to allow resistivity measurements. Test show that the system show a good voltage resolution of 15~nV with typical signals of 1~$\mu$V. We hope to show data from a series of La$_{\rm 2-x}$Sr$_{\rm x}$CuO$_{\rm 4}$ samples. [Preview Abstract] |
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