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Nonlinearity in structural and electronic materials

Description: This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The project strengthens a nonlinear technology base relevant to a variety of problems arising in condensed matter and materials science, and applies this technology to those problems. In this way the controlled synthesis of, and experiments on, novel electronic and structural materials provide an important focus for nonlinear science, while nonlinea… more
Date: November 1, 1997
Creator: Bishop, A. R.; Beardmore, K. M. & Ben-Naim, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Correlational switching between 3{times}1 and 6{times}1 surface reconstructions on Si(111) with submonolayer Ag adsorption

Description: Electron correlations are strongly enhanced in low dimensional systems. Taking correlations as the dominant mechanism, we provide and explanation of the recently observed electrostatically enforced structural phase transition (3x1 to 6x1) on a Si(111) surface with sub-monolayer Ag adsorption.
Date: July 1, 1996
Creator: Kempa, K.; Broido, D.A. & Weitering, H.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Giant negative piezoresistance effect in copper-doped germanium

Description: We have observed a stress-induced decrease of over ten orders of magnitude in the low-temperature electrical resistivity of copper- doped germanium single crystals. The application of large uniaxial stresses in a <001> direction leas to a change in the copper ground- state wavefunction from the highly localized (1s){sup 3} to the much more extended (1s){sup 2}(2s){sup 1} configuration. We attribute the decrease in the resistivity to impurity band conduction by the 2s - holes of the high pressur… more
Date: September 1, 1996
Creator: Dubon, O. D.; Haller, E. E.; Walukiewicz, W. & Beeman, J. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effect of flux flow on self-field instability

Description: Flux flow causes type II superconductors to develop resistance continuously rather than suddenly as transport current increases. This means that the distribution of current among the filaments in a composite conductor is determined not only by their inductive coupling but also by the longitudinal resistance they develop as they begin to carry current. The current distribution is calculated in two cases, taking flux flow into account: a composite clamped suddenly across a constant-current source… more
Date: August 1, 1977
Creator: Dresner, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Materials Sciences Programs. Fiscal Year 1980, Office of Basic Energy Sciences

Description: This report provides a convenient compilation index of the DOE Materials Sciences Division programs. This compilation is intended for use by administrators, managers, and scientists to help coordinate research and as an aid in selecting new programs and is divided into Sections A and B, listing all the projects, Section C, a summary of funding levels, and Section D, an index (the investigator index is in two parts - laboratory and contract research).
Date: September 1, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Workshop on Artificial Superlattices. October 30-31, 1980 at University of Illinois, Urbana-Champaign, Illinois, USA

Description: The program and 24 abstracts are given. The abstracts are divided into the following categories: structure and elastic properties, transport and electronic properties, magnetism and superconductivity, and phonons. The engineering of novel materials using sophisticated preparation techniques has received considerable attention in recent years. This interest has been mainly stimulated by recent developments in preparation techniques such as Molecular Beam Epitaxy, Thermal Vapor Deposition and Spu… more
Date: October 1980
Creator: Argonne National Laboratory
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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INTERNATIONAL CONFERENCE ON ULTRASHORT HIGH-ENERGY RADIATION AND MATTER

Description: The workshop is intended as a forum to discuss the latest experimental, theoretical and computational results related to the interaction of high energy radiation with matter. High energy is intended to mean soft x-ray and beyond, but important new results from visible systems will be incorporated. The workshop will be interdisciplinary amongst scientists from many fields, including: plasma physics; x-ray physics and optics; solid state physics and material science; biology ; quantum optics. Top… more
Date: January 15, 2004
Creator: Wootton, A J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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University of Illinois at Urbana-Champaign, Materials Research Laboratory progress report for FY 1993 and research proposal for FY 1994

Description: The materials research laboratory program is about 30% of total Materials Science and Engineering effort on the Univ. of Illinois campus. Coordinated efforts are being carried out in areas of structural ceramics, grain boundaries, field responsive polymeric and organic materials, molecular structure of solid-liquid interfaces and its relation to corrosion, and x-ray scattering science.
Date: March 1, 1993
Creator: Birnbaum, H. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Neutron scattering study of charge-ordering in R1/3Sr2/3FeO3 (R=La, Pr, Nd, Sm, and Y)

Description: The complicated physical phenomena in complex transition-metal oxides (TMO), such as high T<sub>c</sub> superconductivity, colossal magnetoresistivity, metal-insulator transitions, etc., have long been the focus of intense inquiry and debate in condensed matter science, since they are related to strong electronic correlations and cannot be explained within the 'standard model' of solid state physics. These novel functionalities of the correlated electron systems have a wide range of potential f… more
Date: January 1, 2010
Creator: Ma, Jie
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Summary of Current LLNL Projects with the Russian Federation

Description: Developing a sophisticated theory to understand the electronic structure of 5f-metals is a great challenge to solid state physics. Complicated electronic structures of 5f-metals make their properties strongly sensitive to small energy changes produced by the addition of a small amount of alloy, impurities, or crystal structure defects caused by irradiation. A theoretical material science technique applicable to investigate these effects is atomistic simulation using Classical Molecular Dynamics… more
Date: April 2, 2012
Creator: Schilling, O
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Elementary excitations and phase transitions in crystals

Description: The unique method of measuring elementary excitations in solids over a wide range of energy and momentum transfers is inelastic scattering of neutrons. Elementary excitations are defined as a correlated motion of atoms or spins in a solid which include phonons, magnons, rotons, or crystal field excitations. These excitations play a fundamental role in a wide variety of structural and magnetic phase transitions and provide the information in understanding the underlying microscopic mechanism of … more
Date: December 31, 1993
Creator: Shapiro, S.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Defense, basic, and industrial research at the Los Alamos Neutron Science Center: Proceedings

Description: The Workshop on Defense, Basic, and Industrial Research at the Los Alamos Neutron Science Center gathered scientists from Department of Energy national laboratories, other federal institutions, universities, and industry to discuss the use of neutrons in science-based stockpile stewardship, The workshop began with presentations by government officials, senior representatives from the three weapons laboratories, and scientific opinion leaders. Workshop participants then met in breakout sessions … more
Date: October 1, 1995
Creator: Longshore, A. & Salgado, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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University of Illinois at Urbana-Champaign, Materials Research Laboratory progress report for FY 1991

Description: The Materials Research Laboratory at the University of Illinois is an interdisciplinary laboratory operated in the College of Engineering. Its focus is the science of materials and it supports research in the areas of condensed matter physics, solid state chemistry, and materials science. This report addresses topics such as: an MRL overview; budget; general programmatic and institutional issues; new programs; research summaries for metallurgy, ceramics, solid state physics, and materials chemi… more
Date: October 1, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Materials Sciences Division 1990 annual report

Description: This report is the Materials Sciences Division`s annual report. It contains abstracts describing materials research at the National Center for Electron Microscopy, and for research groups in metallurgy, solid-state physics, materials chemistry, electrochemical energy storage, electronic materials, surface science and catalysis, ceramic science, high tc superconductivity, polymers, composites, and high performance metals.
Date: December 31, 1990
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Basic Studies of Atomic Dynamics. Progress Report, October 1, 1976--September 30, 1977

Description: Progress achieved was in the area of applications of an atomic approach to solid state problems, not only to impurity states, but unexpectedly to general band theory. The development of a postadiabatic procedure was successful in initial tests. Studies of the interaction of electrons with polar molecules and especially of the orientation of atoms by collision are opening new and promising vistas.
Date: October 1, 1977
Creator: Fano, U.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electronic states in systems of reduced dimensionality. Progress report, September 15, 1991--September 14, 1992

Description: This report briefly discusses the following research: magnetically modulated systems, inelastic magnetotunneling, ballistic transport review, screening in reduced dimensions, raman and electron energy loss spectroscopy; and ballistic quantum interference effects. (LSP).
Date: April 15, 1992
Creator: Ulloa, S. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Space-time complexity in solid state models

Description: In this Workshop on symmetry-breaking it is appropriate to include the evolving fields of nonlinear-nonequilibrium systems in which transitions to and between various degrees of ''complexity'' (including ''chaos'') occur in time or space or both. These notions naturally bring together phenomena of pattern formation and chaos and therefore have ramifications for a huge array of natural sciences - astrophysics, plasmas and lasers, hydrodynamics, field theory, materials and solid state theory, opt… more
Date: January 1, 1985
Creator: Bishop, A. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Physics in the fast lane: rotors, fast ions and mobile fermions

Description: Dynamic disorder in the high-temperature solid phases of the Zintl compounds CsPb and NaSn is characterized by. fast orientational motions of the polyanions and coupled motions of the cations Melting is characterized by slow translational motions of the centers of mass of the polyanions. The dynamic behavior of the ions is associated with dramatic increases in electrical conductivity characteristic of the behavior expected of a mixed conductor.
Date: September 1, 1996
Creator: Price, D.L. & Saboungi, M.-L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Four decades in the megagauss world

Description: This paper contains a short history of the generation of megagauss magnetic fields obtained by explosive flux compression at Los Alamos over the last four decades, a brief description of the high field systems most commonly used for solid state research, and a survey of selected physics experiments performed using these systems as high magnetic field sources.
Date: November 1, 1997
Creator: Fowler, Clarence Maxwell
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Note on the cryostatic stability of superconducting composites

Description: A careful discussion is given of the &#x27;&#x27;equal area condition&#x27;&#x27; developed by Maddock et al. In order to make the essential points as clear as possible, analytical solutions are derived under simplifying assumptions (simple model for heat transfer by nucleate and film boiling liquid helium; constant heat conduction and specific heat) instead of using more realistic but less controllable computer calculations. A quantitative definition of the concept of a long wire is given. Num… more
Date: February 1, 1978
Creator: Gauster, W. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flux-line-cutting threshold in type-II superconductors

Description: The stability of the vortex array in a slab geometry is analysed. Numerical calculations of the force exerted on a vortex in a perturbed array exhibit the existence of a threshold for flux-line cutting. For angles exceeding the critical value, the array is driven towards flux-line cutting for small perturbations. The critical angle gradient can be employed to express the threshold for flux-line cutting. (GHT)
Date: March 1, 1980
Creator: Yeh, Y.C.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Applications of mesoscopic physics. Annual technical report, September 1991--June 1992

Description: This report discusses the following topics: Acoustical nondestructive evaluation of heterogeneous materials in the multiple scattering regime. Classical and quantum superdiffusion in a time-dependent random potential. Negative Magnetoresistance in Variable Range Hopping Conduction. Reproducible Conductance Fluctuations in Macroscopic Anderson Insulators. Feasibility of far-infared lasers using multiple semiconductor quantum wells.
Date: July 1, 1992
Creator: Feng, Shechao
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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