Bulletin of the American Physical Society
Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 56, Number 7
Thursday–Saturday, October 6–8, 2011; Commerce, Texas
Session F5: Condensed Matter Physics and Materials Research II |
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Chair: Wilhelmus Geerts, Texas State University--San Marcos Room: Science Building 127 |
Friday, October 7, 2011 3:40PM - 3:52PM |
F5.00001: Measurement of the Spectral Distribution of Low Energy Electrons emitted as a result of MVV Auger Transition in Cu(100) Suman Satyal, P.V. Joglekar, K. Shastry, A.H. Weiss, S.L. Hulbert Auger Photoelectron Coincidence Spectroscopy (APECS) was used to investigate~the physics of the Low Energy tail (LET) region of the Auger spectrum of a Cu (100) sample. A beam of 200eV photons was incident on the sample and two Cylindrical Mirror Analyzers (CMA's) were used to select the energy of electrons emitted from the sample. An APECS spectra was obtained with one of the CMA's fixed at the energy 136.25eV, which corresponds to the core photoemission peak. The APECS spectra contains the contributions from electrons excited by the MVV Auger transition plus a background due to true coincidences~between photo-emitted valence band electrons that undergo inelastic scattering and transfer part of their energy with other valence electrons. Coincidence measurements were made with the fixed analyzer set at various energies between the core and the valence band. These measurements were used to obtain an estimate of the background due to the inelastically scattered valence band electrons. [Preview Abstract] |
Friday, October 7, 2011 3:52PM - 4:04PM |
F5.00002: Materials Testing for an Accelerator-Driven Subcritical Molten Salt Fission System: A look at the Materials Science of Molten Salt Corrosion Elizabeth Sooby, Shreyas Balachandran, David Foley, Karl Hartwig, Peter McIntyre, Supathorn Phongikaroon, Nathaniel Pogue, Michael Simpson, Prabhat Tripathy For an accelerator-driven subcritical molten salt fission core to survive its 50+ year fuel life, the primary vessel, heat exchanger, and various internal components must be made of materials that resist corrosion and radiation damage in a high-temperature environment, (500-800 C). An experimental study of the corrosion behavior of candidate metals in contact with molten salt is being conducted at the Center for Advanced Energy Studies. Initial experiments have been run on Nb, Ta, Ni, two zirconium alloys, Hastelloy-N, and a series of steel alloys to form a base line for corrosion in both chloride and bromide salt. Metal coupons were immersed in LiCl-KCl or LiBr-KBr at 700 C in an inert-atmosphere. Salt samples were extracted on a time schedule over a 24-hr period. The samples were analyzed using inductively coupled plasma-mass spectrometry to determine concentrations of metals from corrosion. Preliminary results will be presented. [Preview Abstract] |
Friday, October 7, 2011 4:04PM - 4:16PM |
F5.00003: Thermal conductivity and specific heat of Ni nanowires Denis Myasishchev, Nenad Stojanovic, Troy Mills, Jordan Berg, Mark Holtz As dimensions of materials shrink, important physical properties deviate from their corresponding bulk values. A critical example is thermal conductivity, which drops dramatically at the nanoscale. Effective power dissipation is crucial for solid state devices, but thermal conductivity decreasing with size complicates miniaturization efforts. There have been very few direct measurements of thermal conductivity of nanoscale structures. The 3$\omega $ method is a technique for measuring thermal conductivity of a film- or rod-like specimen. The approach~has been~tested on a large (25 $\mu $m diameter) Pt wire over a broad temperature range. The setup built may also be used for 3$\omega $~film measurement and is currently being tested on Pyrex glass. Results for 100 nm Ni nanowire specimens will be discussed.~ [Preview Abstract] |
Friday, October 7, 2011 4:16PM - 4:28PM |
F5.00004: Quantum Hall Superfluids in Topological Insulator Thin Films Dagim Tilahun, Byounghak Lee, Ewelina Hankiewicz, Allan MacDonald Three-dimensional topological insulators have protected Dirac-cone surface states. In this paper we propose magnetic field induced topological insulator thin film ordered states in which coherence is established spontaneously between top and bottom surfaces. We find that the large dielectric constants of these materials increases the layer separation range over which coherence survives and decreases the superfluid sound velocity, but has little influence on superfluid density or charge gap. The coherent state at total Landau-level filling factor $\nu_T=0$ is predicted to be free of edge modes, qualitatively altering its transport phenomenology. [Preview Abstract] |
Friday, October 7, 2011 4:28PM - 4:40PM |
F5.00005: Lithium Iron Phosphate doped on the Iron side with Zirconium Andrew Trenchard, Hanu Arava, Hui Fang, Gan Liang Lithium ion batteries were constructed from both carbon and noncarbon coated LiFePO$_{4}$ that was doped with Zirconium on the Iron side at 1{\%}, 2{\%} and 3{\%}. The charge and discharge capacities of the batteries were measured at various C-rates. The results were compared amongst the various rates. The process for constructing the batteries as well as the results will be presented. [Preview Abstract] |
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