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Topic Area: Condensed Matter Physics

Displaying records 51 to 60 of 111 records.
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51. Polaron Formation in the Optimarlly Doped Ferromagnetic Maganites La^d0.7^Sr^d0.3MnO^d3^ and La^0.7Bx^0.3MnO^d3^
Topic: Condensed Matter Physics
Published: 12/17/2008
Authors: Ying Chen, Benjamin Ueland, Jeffrey W. Lynn, G.L. Bychkov, S.N. Barilo, Y.M. Mukovskii
Abstract: The nature of the polarons in the optimally doped colossal magnetoresistive (CMR) materials La^d0.7^Ba^d0.3^ (LBMO and La^d0.7^Sr^d0.3^MnO^d3^ (LSMO is studied by elastic and inelastic neutron scattering. In both materials, dynamic nanoscale polaron ...

52. Josephson phase qubit circuit for the evaluation of advanced tunnel barrier materials
Topic: Condensed Matter Physics
Published: 11/21/2008
Authors: Jeffrey S. Kline, Haohua Wang, Seongshik Oh, John M Martinis, David P Pappas
Abstract: We have found that crystalline Josephson junctions have critical current density control problems which decrease circuit yield. We present a qubit circuit designed to accommodate a factor-of-five variation in critical current density for the evaluati ...

53. Surviving the Transition
Topic: Condensed Matter Physics
Published: 10/31/2008
Author: Kristian Helmerson
Abstract: Observations of the birth of a superfluid have uncovered details of the microphysics of phase transitions. Whether these results can be used to model such trnsitions in the early Universe is an open question.

54. Ultra-high resolution alpha particle spectroscopy using calorimetry
Topic: Condensed Matter Physics
Published: 9/23/2008
Authors: Robert Daniel Horansky, Joel Nathan Ullom, James A Beall, Gene C Hilton, Kent D Irwin, Don Dry, Beth Hastings, Stephen Lamont, Clifford R Rudy, Michael W Rabin
Abstract: Calorimetry has been used since the late 1700?s to measure the heat output of physical processes ranging from chemical reactions to the respiration of organisms . Calorimetry is performed by measuring the temperature change caused by heat release int ...

55. Shear Thinning Near the Critical Point of Xenon
Topic: Condensed Matter Physics
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...

56. Residual Multiparticle Entropy Does Not Generally Change Sign Near Freezing
Topic: Condensed Matter Physics
Published: 4/13/2008
Authors: William P. Krekelberg, Vincent K Shen, Jeffrey R. Errington, Thomas M. Truskett
Abstract: The residual multiparticle entropy (RMPE) of two- and three-dimensional fluids changes sign near the freezing line, providing a quasi-universal one-phase rule for the location of the liquid-solid transition. We present new simulation results ford- ...

57. Comparative Study of the Effect of Tail Corrections on Surface Tension Determined by Molecular Simulation
Topic: Condensed Matter Physics
Published: 5/12/2007
Authors: Vincent K Shen, Raymond Dale Mountain, Jeffrey R. Errington
Abstract: We report results from a comparative study of the influence of tail corrections on the surface tension of the Lennard-Jones fluid. We find that cutoff-independent surface tensions can be obtained by applying a set of tail corrections recently introdu ...

58. Molecular simulation of the diffusivity of NaOH in steam
Topic: Condensed Matter Physics
Published: 6/1/2005
Authors: Allan H Harvey, Raymond Dale Mountain
Abstract: Molecular dynamics simulation is used to calculate the infinite-dilution diffusivity of sodium hydroxide (NaOH) in steam at conditions of temperature and density typical of steam turbines. These data are needed in order to better understand depositio ...

59. Dipole Moment of a Pb-O Vacancy Pair in PbTiO^d3^
Topic: Condensed Matter Physics
Published: 4/1/2004
Authors: Eric J Cockayne, Benjamin P Burton
Abstract: The polarization of a nearest-neighbor (nn) Pb-O vacancy pair in PbTiO3 is calculated, using the modern theory of polarization, implemented in the density functional theory ultrasoft pseudopotential formalism. The dipole moment per divacancy is about ...

60. Temperature-Dependent Behavior of PbSc^d1/2^Nb^d1/2^O^d3^ From First Principles
Topic: Condensed Matter Physics
Published: 7/1/2001
Authors: Eric J Cockayne, Benjamin P Burton, L Bellaiche
Abstract: We study the ferroelectric phase transition in PbSc1/2Nb1/2O3 (PSN) using a first-principles effective Hamiltonian approach. Results for PSN with NaCl-type ordering of Sc and Nb on the B sites shows that a Pb-centered effective Hamiltonian is approp ...

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