Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 59, Number 11
Friday–Saturday, October 17–18, 2014; Orem, Utah
Session B1: Condensed Matter I |
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Chair: Heinz Nakotte, New Mexico State University Room: Science Building 031 |
Friday, October 17, 2014 10:15AM - 10:39AM |
B1.00001: High pressure superconducting phase diagram of 6Li: anomalous isotope effects in dense lithium Invited Speaker: Shanti Deemyad The emergence of exotic quantum states, such as fluid ground state and two component superconductivity and superfluidity, in a compressed light metallic system has been entertained theoretically for metallic phases of hydrogen. The difficulty of compressing hydrogen to metallization densities, has prevented experimental proof of these effects. Studying lithium, which is isovalent to hydrogen and the lightest metal, is considered as a route to studying the lattice quantum effects in a dense light metallic system. In this talk by comparing the superconductivity of lithium isotopes under pressure, I present evidence that properties of lithium at low temperature are significantly dominated by its lattice quantum dynamics. I will also present the superconducting phase diagram of 6Li in a broad range of pressures up to 60GPa. This study is the first experimental report on superconducting properties of 6Li; the lightest superconducting material. [Preview Abstract] |
Friday, October 17, 2014 10:39AM - 11:03AM |
B1.00002: X-ray Nanovision: Probing the Ultra-small and Capturing the Ultr-fast Invited Speaker: Edwin Fohtung Lensless X-ray Imaging or coherent x-ray diffraction imaging based is a form of microscopy that can provide detailed real-space information of both real and imaginary parts of the complex order parameters (such as strain, orbital, charge or spin). This technique is based on the reconstruction of reciprocal space diffraction and speckle ``snapshot'' pattern back into real space image based on phase-retrieval algorithms. I will demonstrate the applicability of coherent diffraction imaging to study nanoscale strain in Li-battery nanoparticles, ferroelectricity, ferroelasticity and magnetic domains in device relevant heterostructures. I will discuss the future applications of lensless microscopy with the emergence of 4$^{\mathrm{th}}$generation light sources. [Preview Abstract] |
Friday, October 17, 2014 11:03AM - 11:15AM |
B1.00003: Oxidation-Reduction Potential of Iron Encapsulated by Ferritin Jacob Embley, John Colton, Richard Watt, Trevor Smith, Cameron Olsen, Kevin Zenner, Stephen Erickson Ferritin is a naturally occurring spherical protein about 10 nm in diameter, with a hollow interior that can encapsulate up to 4500 Fe atoms in a ferrihydrite iron oxide nanoparticle. Due to the unique properties of ferritin in maintaining the structure of the iron nanoparticles, it has potential for use in nanobattery devices. We are characterizing the reduction-oxidation potential of these nanoparticles under varying conditions using electrochemical techniques. We have found that the presence of different salt anions with the ferritin can significantly alter the oxidation-reduction potential. As a result of this difference in oxidation-reduction potential, ferritin could be utilized in the electrodes of a nanobattery. [Preview Abstract] |
Friday, October 17, 2014 11:15AM - 11:27AM |
B1.00004: Properties of alkali-doped aromatic hydrocarbons under extreme pressures Ella Olejnik, Anne Marie Schaeffer, Shanti Deemyad While structures of benzene (C6H6), which is the simplest and most abundant aromatic hydrocarbon in the solar system, have been extensively studied under pressure, the properties of benzene derivatives are poorly studied under extreme conditions. In this work, we studied the pressure dependent structural properties of Phenylithium (C6H6Li) which is one of the simplest organo-alkali metallic compounds, in a diamond anvil cell for upto 32 GPa. We observed the initial polycrystalline lines under pressures of a few GPa. With the increasing of pressures, we have seen evidence of formation of new crystal structure under above 32 GPa with strong single crystal line. Phenylithuim has a strong luminescence under pressure which was evidenced by the changing color of the sample to orange. The structural studies have been done in advanced light source. [Preview Abstract] |
Friday, October 17, 2014 11:27AM - 11:39AM |
B1.00005: Crystal Structures and Oxygen Position in Prussian Blue Analogs Michael Boergert, Manjita Shrestha, Luke Daemen, Graham King, Edwin Fohtung, Heinz Nakotte Prussian Blue Analogs (PBAs) are a family of compounds that crystallize in cubic structures similar to the parent Prussian Blue, Fe$_{4}$(Fe(CN)$_{6})_{2}$. In recent years, some PBAs have attracted attention because of negative thermal expansion effects. In PBAs, other metal cations occupy the Fe$^{2+}$ and Fe$^{3+}$ positions of the original Prussian Blue. The 3d transition metal PBAs synthesize at compositions M$_{3}$(M'(CN)$_{6})_{2}$.xH2O, where M and M' are the metal ions and x is the number of water molecules. The metals lie at the center of an alternating octahedral C and N framework. For some of the compounds, one finds that there are additional metal ions in the centers of the octahedral framework while for others there is evidence for defects within the octrahedrals. Moreover, PBAs typically accommodate between 10 and 20 water molecules per unit cell. In this study, neutron diffraction was used to identify the crystal structures and the location of the oxygens from the water molecules for five PBAs, namely Co$_{3}$(Cr(CN)$_{6})_{2}$, Co$_{3}$(Fe(CN)$_{6})_{2}$, Cu$_{3}$(Fe(CN)$_{6})_{2}$, Mn$_{3}$(Fe(CN)$_{6})_{2}$, and Ni$_{3}$(Fe(CN)$_{6})_{2}$. [Preview Abstract] |
Friday, October 17, 2014 11:39AM - 11:51AM |
B1.00006: Re-emergent Superconductivity of KFeSe Under Pressure Jasmine Bishop, Anne Marie Schaeffer, Florence Doval, Shanti Deemyad Studying the pressure dependence of superconducting properties of various materials allows better understanding the mechanism of their superconductivity and provides intuition for designing better superconducting systems with high transition temperature. Extreme high static pressures can be created in laboratory using a device known as diamond anvil cell (DAC). DACs can be used to study the electrical, magnetic and optical properties of a material during an experiment, making DACs an extremely useful experimental tool. Fe-based superconductors are newly discovered class of superconductors that fall outside of behavior explained by conventional BSC theory. A recent study found the re-emergence of superconductivity at significantly higher critical temperatures in some iron chalcogenides above 11.5 GPa; one of the studied compounds was KFeSe (Ref 1). The re-emerging phase of superconductivity here is not associated with a structural phase transition and is an unusual effect. We repeated this experiment with a compound of KFeSe with similar stoichiometry in order further study or verify the possibility of a re-emergence of the superconducting phase. Here I will present our recent experimental results on pressure dependence of superconducting phase diagram of KFeSe in comparison with previous studies on this material and I will discuss the possible origin of the differences found between the two experiments. \\[4pt] [1] Sun, L., Chen, X., Guo, J., Gao, P., Huang, Q., Wang, H.,...Zhao, Z. (2012). Re-emerging superconductivity at 48 kelvin in iron chalcogenides. \textit{Nature}, 483, 67-69. doi: 10.1038/nature10813 [Preview Abstract] |
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