J. L. Fry

American Rock Mechanics Association

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N. G. Fazleev

The University of Texas at Arlington

A. H. Weiss

Great Ormond Street Hospital

N. E. Brener

Louisiana State University

Z. E. Musielak

The University of Texas at Arlington

Pratap Pattnaik

IBM (United States)

James M. Rejcek

The University of Texas at Arlington

Peter M. Levy

New York University

G. Fletcher

Monash University

S. Starnes

The University of Texas at Arlington

Asok Ray

Pennsylvania State University

Cooperative Institutions

The University of Texas at Arlington

Lawrence Berkeley National Laboratory

European Organization for Nuclear Research

University of Wisconsin–Madison

University of California, Berkeley

Louisiana State University

University of California, Los Angeles

University of Florida

New York University

Centre National de la Recherche Scientifique

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Spin polarization in paramagnetic layers on magnetic substrates

Journal of Applied Physics (1993)

Zhu-Pei Shi Peter M. Levy J. L. Fry

The spin polarization of conduction electrons in a paramagnetic layer due to an adjacent magnetic layer has been derived based on the mixing interaction between the local and conduction electrons. Specifically, based on the band structure of paramagnetic chromium, we have calculated the spin polarization in a Cr layer on Fe(100) substrates. The results are in reasonably good agreement with recent experimental data.

10.1063/1.353488

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Citations (6)

Positrons as probes of the Si(100)-2¥1 and Si(111)-7¥7 surfaces

APS March Meeting Abstracts (2000)

J. L. Fry N. G. Fazleev S. Starnes A. H. Weiss

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Feynman-Kac Path Integral Calculations of Atomic Properties of He, Li and Be with High-Quality Trial Wavefunctions.

APS March Meeting Abstracts (2002)

J. L. Fry Saumen Datta N. G. Fazleev S. A. Alexander R. L. Coldwell

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Studies of the Auger spectrum from the Si(111) surface using positron annihilation induced Auger electron spectroscopy

Radiation Physics and Chemistry (2003)

N. G. Fazleev J. L. Fry S. Starnes A. H. Weiss

Auger electron spectroscopy

Annihilation

Auger effect

Electron spectroscopy

10.1016/s0969-806x(03)00242-1

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Astronomical constraints on quantum theories of cold dark matter – II. Supermassive black holes and luminous matter

Monthly Notices of the Royal Astronomical Society (2015)

Shane Spivey Z. E. Musielak J. L. Fry

Our previous model of quantum cold dark matter (QCDM) is expanded to include the influence of supermassive black holes located at centres of different galaxies and galactic luminous (baryonic) matter distributions. The inclusion of a black hole to the galactic potential is shown to produce a more concentrated halo with a cuspier core. The addition of a small-scale galactic luminous matter distribution also concentrates the halo, while a large-scale distribution diffuses it; nevertheless, in either case the smooth core of the halo is preserved. Effects caused by including a non-linear scattering term are investigated by solving the Gross–Pitaevskii equation. The obtained results demonstrate that the scattering term produces a rounder and more diffuse density profile. Moreover, adding a sufficiently large black hole in combination with this term results in an even cuspier profile than the black hole alone. As a result of all these additions, our extended QCDM model can be applied to a much larger range of dark matter halo shapes and sizes.

Cold dark matter

Black hole (networking)

Cuspy halo problem

10.1093/mnras/stv066

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Study of critical properties of the Potts model by the modified variational cumulant expansion method

Journal of Applied Physics (1994)

N. G. Fazleev Hao Che J. L. Fry D. L. Lin

The modified variational cumulant expansion (VCE) method valid for the whole temperature range and for arbitrary fields is developed to study the critical properties of the general q-state Potts model used to stimulate various magnetic systems. The series expansion is generated directly in terms of the Potts Hamiltonian. The free energy and the internal energy are calculated up to the third-order cumulant terms for the d-dimensional hypercubic q-state Potts model. The expression for the critical temperature Tc is derived in a closed form which allows to determine Tc up to arbitrary order cumulant terms. The modified VCE method eliminates the unphysical first-order phase transition at the mean-field critical point in the internal energy of the Potts model which plagues the conventional VCE method.

Cumulant

Chiral Potts curve

Hamiltonian (control theory)

Critical point (mathematics)

Internal energy

10.1063/1.358262

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Low Energy Positrons at the Si(100)-2x1 Surface with Adsorbed Hydrogen and Oxygen

Materials science forum (2001)

N. G. Fazleev J. L. Fry A. H. Weiss

10.4028/www.scientific.net/msf.363-365.451

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Citations (2)

Positron-annihilation-induced Auger-electron-spectroscopy studies of properties of an alkali-metal overlayer on the Cu(100) surface

Physical review. B, Condensed matter (1994)

N. G. Fazleev J. L. Fry J.H. Kaiser A. R. Köymen K. H. Lee

Positron-annihilation-induced Auger-electron spectroscopy (PAES) employs positrons trapped at the surface to create core-holes and to initiate the Auger process in atoms in the topmost layer of the surface. The results of experimental and theoretical investigations of the attenuation of the positron-annihilation-induced Cu ${\mathit{M}}_{2,3}$VV Auger signal with Cs coverage on the Cu(100) surface at low and high temperatures are discussed. They reveal that at 163 K the normalized intensity of the positron-annihilation-induced Cu ${\mathit{M}}_{2,3}$VV Auger signal remains nearly constant at the clean-surface value until the Cs coverage reaches approximately 0.7 physical monolayer, at which point the signal intensity drops precipitously. We present an analysis of this unusual behavior using a model that treats the positron as trapped in a double-well potential in the direction perpendicular to the surface: one well is associated with the Cu substrate and the other with the Cs adsorbate. The sharp drop in the Cu PAES intensity which occurs over a small change in the Cs coverage is attributed to a migration of positrons trapped at low Cs coverages at the Cs/Cu interface to the positron surface state on the vacuum side of the alkali-metal overlayer at high Cs coverages. This migration can be accounted for in terms of a structural phase transition in the Cs overlayer from a disordered distribution of adsorbate atoms to adsorbate metallic islands with an ordered hexagonal close-packed structure.

Overlayer

Auger electron spectroscopy

10.1103/physrevb.49.10577

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Citations (10)

Electron Transport in Condensed Water

Radiation Protection Dosimetry (1994)

Marco Zaider M. Vračko Albert Fung J. L. Fry

10.1093/oxfordjournals.rpd.a082177

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Citations (26)

Antiferromagnetic Bias in the Interlayer Magnetic Coupling

EPL (Europhysics Letters) (1994)

Zhu-Pei Shi Peter M. Levy J. L. Fry

The interlayer coupling for thin spacer layers is predominantly antiferromagnetic in some metallic multilayered structures. We interpret this tendency towards antiferromagnetism to arise from a competition between RKKY-like and superexchange contributions to the coupling. For a free-electron gas with no structure in the density of states above the Fermi level there is a complete cancellation of these contributions, so that coupling derived from the s-d model is indistinguishable from a point contact spin-dependent scattering potential. However, in real solids the non-cancellation of the non-oscillatory parts of these two contributions, i.e. antiferromagnetic bias, can arise from the structure of the density of states of the spacer layer close to the Fermi surface.

Superexchange

Density of states

RKKY interaction

10.1209/0295-5075/26/6/013

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Citations (27)