1
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Singh AK, Banerjee V. Accelerated inertial regime in the spinodal decomposition of magnetic fluids. SOFT MATTER 2023; 19:2370-2376. [PMID: 36920058 DOI: 10.1039/d3sm00285c] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Furukawa predicted that at late times, the domain growth in binary fluids scales as (t) ∼ t2/3, and the growth is driven by fluid inertia. The inertial growth regime has been highly elusive in molecular dynamics (MD) simulations. We perform coarsening studies of the (d = 3) Stockmayer (SM) model comprising of magnetic dipoles that interact via long-range dipolar interactions as well as the usual Lennard-Jones (LJ) potential. This fascinating polar fluid exhibits a gas-liquid phase coexistence, and magnetic order even in the absence of an external field. From comprehensive MD simulations, we observe the inertial scaling [(t) ∼ t2/3] in the SM fluid for an extended time window. Intriguingly, the fluid inertia is overwhelming from the outset - our simulations do not show the early diffusive regime [(t) ∼ t1/3] and the intermediate viscous regime [(t) ∼ t] prevalent in LJ fluids.
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Affiliation(s)
- Anuj Kumar Singh
- Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016, India.
| | - Varsha Banerjee
- Department of Physics, Indian Institute of Technology Delhi, New Delhi, 110016, India.
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2
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Assefa TA, Seaberg MH, Reid AH, Shen L, Esposito V, Dakovski GL, Schlotter W, Holladay B, Streubel R, Montoya SA, Hart P, Nakahara K, Moeller S, Kevan SD, Fischer P, Fullerton EE, Colocho W, Lutman A, Decker FJ, Sinha SK, Roy S, Blackburn E, Turner JJ. The fluctuation-dissipation measurement instrument at the Linac Coherent Light Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:083902. [PMID: 36050107 DOI: 10.1063/5.0091297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
The development of new modes at x-ray free electron lasers has inspired novel methods for studying fluctuations at different energies and timescales. For closely spaced x-ray pulses that can be varied on ultrafast time scales, we have constructed a pair of advanced instruments to conduct studies targeting quantum materials. We first describe a prototype instrument built to test the proof-of-principle of resonant magnetic scattering using ultrafast pulse pairs. This is followed by a description of a new endstation, the so-called fluctuation-dissipation measurement instrument, which was used to carry out studies with a fast area detector. In addition, we describe various types of diagnostics for single-shot contrast measurements, which can be used to normalize data on a pulse-by-pulse basis and calibrate pulse amplitude ratios, both of which are important for the study of fluctuations in materials. Furthermore, we present some new results using the instrument that demonstrates access to higher momentum resolution.
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Affiliation(s)
- T A Assefa
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M H Seaberg
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A H Reid
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - L Shen
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - V Esposito
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - W Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - B Holladay
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - R Streubel
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA
| | - S A Montoya
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
| | - P Hart
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - K Nakahara
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S Moeller
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S D Kevan
- Department of Physics, University of Oregon, Eugene, Oregon 97401, USA
| | - P Fischer
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Physics Department, University of California Santa Cruz, Santa Cruz, California 95064, USA
| | - E E Fullerton
- Center for Memory and Recording Research, University of California-San Diego, La Jolla, California 92093, USA
| | - W Colocho
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - A Lutman
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - F-J Decker
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA
| | - S K Sinha
- Department of Physics, University of California-San Diego, La Jolla, California 92093, USA
| | - S Roy
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - E Blackburn
- Division of Synchrotron Radiation Research, Department of Physics, Lund University, 22100 Lund, Sweden
| | - J J Turner
- Stanford Institute for Materials and Energy Science, Stanford University and SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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3
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Myint P, Ludwig KF, Wiegart L, Zhang Y, Fluerasu A, Zhang X, Headrick RL. de Gennes Narrowing and Relationship between Structure and Dynamics in Self-Organized Ion-Beam Nanopatterning. PHYSICAL REVIEW LETTERS 2021; 126:016101. [PMID: 33480781 DOI: 10.1103/physrevlett.126.016101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
Investigating the relationship between structure and dynamical processes is a central goal in condensed matter physics. Perhaps the most noted relationship between the two is the phenomenon of de Gennes narrowing, in which relaxation times in liquids are proportional to the scattering structure factor. Here, a similar relationship is discovered during the self-organized ion-beam nanopatterning of silicon using coherent x-ray scattering. However, in contrast to the exponential relaxation of fluctuations in classic de Gennes narrowing, the dynamic surface exhibits a wide range of behaviors as a function of the length scale, with a compressed exponential relaxation at lengths corresponding to the dominant structural motif-self-organized nanoscale ripples. These behaviors are reproduced in simulations of a nonlinear model describing the surface evolution. We suggest that the compressed exponential behavior observed here is due to the morphological persistence of the self-organized surface ripple patterns which form and evolve during ion-beam nanopatterning.
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Affiliation(s)
- Peco Myint
- Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, USA
| | - Karl F Ludwig
- Department of Physics and Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, USA
| | - Lutz Wiegart
- National Synchrotron Light Source II, Brookhaven National Lab, Upton, New York 11973, USA
| | - Yugang Zhang
- National Synchrotron Light Source II, Brookhaven National Lab, Upton, New York 11973, USA
| | - Andrei Fluerasu
- National Synchrotron Light Source II, Brookhaven National Lab, Upton, New York 11973, USA
| | - Xiaozhi Zhang
- Department of Physics and Materials Science Program, University of Vermont, Burlington, Vermont 05405, USA
| | - Randall L Headrick
- Department of Physics and Materials Science Program, University of Vermont, Burlington, Vermont 05405, USA
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4
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Lal J, Lurio LB, Liang D, Narayanan S, Darling SB, Sutton M. Universal dynamics of coarsening during polymer-polymer thin-film spinodal dewetting kinetics. Phys Rev E 2020; 102:032802. [PMID: 33076025 DOI: 10.1103/physreve.102.032802] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 08/23/2020] [Indexed: 06/11/2023]
Abstract
The dewetting dynamics of a supported bilayer polymer thin film on a solid substrate is investigated using grazing incidence x-ray photon correlation spectroscopy. We find that the top layer dewets via the spinodal mechanism. The kinetics of the dewetting is studied by monitoring the time evolution of the surface diffuse x-ray scattering intensity. We study the time evolution of fluctuations about the average surface structure by measuring the two-time x-ray intensity fluctuation correlation functions. Using these two-time correlation functions we quantify the crossover from early-time diffusive dynamics to hydrodynamics. The early diffusive regime satisfies dynamic universality. The two-time correlation functions also quantify the onset of hydrodynamic effects. The hydrodynamic regime is observed during the spinodal dewetting process as these interactions are not screened.
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Affiliation(s)
- J Lal
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
| | - L B Lurio
- Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
| | - D Liang
- Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Narayanan
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S B Darling
- Chemical Sciences and Engineering, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Sutton
- Physics Department, McGill University, Montréal, H3A 2T8, Canada
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5
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X-Ray Photon Correlation Spectroscopy with Coherent Nanobeams: A Numerical Study. CRYSTALS 2020. [DOI: 10.3390/cryst10090766] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
X-ray photon correlation spectroscopy accesses a wide variety of dynamic phenomena at the nanoscale by studying the temporal correlations among photons that are scattered by a material in dynamical equilibrium when it is illuminated with a coherent X-ray beam. The information that is obtained is averaged over the illuminated area, which is generally of the order of several square microns. We propose here that more local information can be obtained by using nanobeams with great potential for the study of heterogeneous systems and show the feasibility of this approach with the support of numerical simulations.
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6
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Microscopic structural response of nanoparticles in styrene–butadiene rubber under cyclic uniaxial elongation. Polym J 2018. [DOI: 10.1038/s41428-018-0135-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Bikondoa O. On the use of two-time correlation functions for X-ray photon correlation spectroscopy data analysis. J Appl Crystallogr 2017; 50:357-368. [PMID: 28381968 PMCID: PMC5377338 DOI: 10.1107/s1600576717000577] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 01/11/2017] [Indexed: 11/10/2022] Open
Abstract
Multi-time correlation functions are especially well suited to study non-equilibrium processes. In particular, two-time correlation functions are widely used in X-ray photon correlation experiments on systems out of equilibrium. One-time correlations are often extracted from two-time correlation functions at different sample ages. However, this way of analysing two-time correlation functions is not unique. Here, two methods to analyse two-time correlation functions are scrutinized, and three illustrative examples are used to discuss the implications for the evaluation of the correlation times and functional shape of the correlations.
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Affiliation(s)
- Oier Bikondoa
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
- XMaS, The UK–CRG Beamline, ESRF – The European Synchrotron, CS40220, F-38043 Grenoble Cedex 09, France
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8
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Synchrotron X-ray scattering and photon correlation spectroscopy studies on thin film morphology details and structural changes of an amorphous-crystalline brush diblock copolymer. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.08.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Carnis J, Cha W, Wingert J, Kang J, Jiang Z, Song S, Sikorski M, Robert A, Gutt C, Chen SW, Dai Y, Ma Y, Guo H, Lurio LB, Shpyrko O, Narayanan S, Cui M, Kosif I, Emrick T, Russell TP, Lee HC, Yu CJ, Grübel G, Sinha SK, Kim H. Demonstration of feasibility of X-ray free electron laser studies of dynamics of nanoparticles in entangled polymer melts. Sci Rep 2014; 4:6017. [PMID: 25109363 PMCID: PMC4127496 DOI: 10.1038/srep06017] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Accepted: 07/23/2014] [Indexed: 11/09/2022] Open
Abstract
The recent advent of hard x-ray free electron lasers (XFELs) opens new areas of science due to their exceptional brightness, coherence, and time structure. In principle, such sources enable studies of dynamics of condensed matter systems over times ranging from femtoseconds to seconds. However, the studies of "slow" dynamics in polymeric materials still remain in question due to the characteristics of the XFEL beam and concerns about sample damage. Here we demonstrate the feasibility of measuring the relaxation dynamics of gold nanoparticles suspended in polymer melts using X-ray photon correlation spectroscopy (XPCS), while also monitoring eventual X-ray induced damage. In spite of inherently large pulse-to-pulse intensity and position variations of the XFEL beam, measurements can be realized at slow time scales. The X-ray induced damage and heating are less than initially expected for soft matter materials.
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Affiliation(s)
- Jerome Carnis
- Department of Physics, Sogang University, Seoul 121-742, Korea
| | - Wonsuk Cha
- Department of Physics, Sogang University, Seoul 121-742, Korea
| | - James Wingert
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Jinback Kang
- Department of Physics, Sogang University, Seoul 121-742, Korea
| | - Zhang Jiang
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Sanghoon Song
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Marcin Sikorski
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Aymeric Robert
- LCLS, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Christian Gutt
- 1] Deutsches Elektronen-Synchrotron (DESY), Notkestraβe 85, D-22607 Hamburg, Germany [2] The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany [3] Department of Physik, University of Siegen, D-57068 Siegen, Germany
| | - San-Wen Chen
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Yeling Dai
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Yicong Ma
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Hongyu Guo
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Laurence B Lurio
- Department of Physics, Northern Illinois University, De Kalb, IL 60115, USA
| | - Oleg Shpyrko
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Suresh Narayanan
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Mengmeng Cui
- Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003, USA
| | - Irem Kosif
- Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003, USA
| | - Todd Emrick
- Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003, USA
| | - Thomas P Russell
- Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003, USA
| | - Hae Cheol Lee
- Pohang Accelerator Laboratory, Pohang, Gyeongbuk 790-784, Korea
| | - Chung-Jong Yu
- Pohang Accelerator Laboratory, Pohang, Gyeongbuk 790-784, Korea
| | - Gerhard Grübel
- 1] Deutsches Elektronen-Synchrotron (DESY), Notkestraβe 85, D-22607 Hamburg, Germany [2] The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Sunil K Sinha
- Department of Physics, University of California, San Diego, CA 92093, USA
| | - Hyunjung Kim
- Department of Physics, Sogang University, Seoul 121-742, Korea
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10
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Chesnel K, Nelson J, Wilcken B, Kevan SD. Mapping spatial and field dependence of magnetic domain memory by soft X-ray speckle metrology. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:293-306. [PMID: 22514162 DOI: 10.1107/s0909049512008047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 02/22/2012] [Indexed: 05/27/2023]
Abstract
The occurrence of magnetic domain memory has been observed in ferromagnets, either induced by structural defects or by exchange couplings. Being able to quantify the amount of memory as a function of length scale, field and temperature is both of fundamental and technological importance. A technique has been refined to statistically quantify the magnetic domain memory in ferromagnetic thin films by using coherent soft-X-ray scattering metrology. This technique, based on cross-correlating magnetic speckle patterns, provides a unique way to map out the behavior of domain memory. Here, the details of our correlation method and the necessary treatment of the X-ray scattering images to extract spatial and field dependences in the memory information are reviewed. The resulting correlation maps, measured on [Co/Pd]IrMn multilayers, show how magnetic domain memory evolves at various spatial scales, as a function of the field magnitude throughout magnetization cycles, but also as a function of field cycling and of temperature. This technique can easily be applied to a wide variety of systems presenting memory effects, in soft and hard matter, and also to dynamical studies.
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Affiliation(s)
- K Chesnel
- Physics Department, Brigham Young University, UT 84602, USA.
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Beutier G, Marty A, Livet F, van der Laan G, Stanescu S, Bencok P. Soft X-ray coherent scattering: instrument and methods at ESRF ID08. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:093901. [PMID: 17902956 DOI: 10.1063/1.2779218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
An experimental setup has been developed to perform soft x-ray coherent scattering at beamline ID08 of the European Synchrotron Radiation Facility. An intense coherent beam was obtained by filtering the primary beam with the monochromator and a circular pinhole. A pinhole holder with motorized translations was installed inside the UHV chamber of the diffractometer. The scattered intensity was recorded in reflection geometry with a back-illuminated charge coupled device camera. As a demonstration we report experimental results of resonant magnetic scattering using coherent beam. The degree of coherence is evaluated, and it is shown that, while the vertical coherence is much higher than the horizontal one at the source, the situation is reversed at the diffractometer. The intensity of the coherent beam is also discussed.
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Affiliation(s)
- Guillaume Beutier
- DRFMC, SP2M, CEA Grenoble, 17 avenue des Martyrs, 38054 Grenoble Cedex, France.
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12
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Livet F. Diffraction with a coherent X-ray beam: dynamics and imaging. Acta Crystallogr A 2007; 63:87-107. [PMID: 17301470 PMCID: PMC2525861 DOI: 10.1107/s010876730605570x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2006] [Accepted: 12/21/2006] [Indexed: 11/10/2022] Open
Abstract
Methods for carrying out coherent X-ray scattering experiments are reviewed. The brilliance of the available synchrotron sources, the characteristics of the existing optics, the various ways of obtaining a beam of controlled coherence properties and the detectors used are summarized. Applications in the study of the dynamics of speckle patterns are described. In the case of soft condensed matter, the movement of inclusions like fillers in polymers or colloidal particles can be observed and these can reflect polymer or liquid-crystal fluctuations. In hard condensed-matter problems, like phase transitions, charge-density waves or phasons in quasicrystals, the study of speckle fluctuations provides new time-resolved methods. In the domain of lensless imaging, the coherent beam gives the modulus of the sample Fourier transform. If oversampling conditions are fulfilled, the phase can be obtained and the image in the direct space can be reconstructed. The forthcoming improvements of all these techniques are discussed.
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Affiliation(s)
- Frédéric Livet
- LTPCM-ENSEEG, UMR-CNRS 5614, INPG/UJF, BP 75, 38402 St Martin d'Hères, France.
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13
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Stadler LM, Sepiol B, Pfau B, Kantelhardt JW, Weinkamer R, Vogl G. Detrended fluctuation analysis in x-ray photon correlation spectroscopy for determining coarsening dynamics in alloys. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:041107. [PMID: 17155022 DOI: 10.1103/physreve.74.041107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2006] [Revised: 07/14/2006] [Indexed: 05/12/2023]
Abstract
We study the dynamics of precipitate coarsening in phase-separating alloys at late stages of phase separation by x-ray photon correlation spectroscopy (XPCS). For analyzing time series of fluctuating speckle intensities from small-angle scattering of coherent x rays, the method of detrended fluctuation analysis (DFA), which is ideal for determining power-law correlations, is applied. We discuss the application of DFA with respect to XPCS data by means of simulated time series. In particular, the effects of different signal-to-noise ratios are examined. Results from measurements of the two model systems Al-6 at. % Ag at 140 degrees C and Al-9 at. % Zn at 0 degrees C are presented. Since the DFA effectively removes adulterating trends in the data, quantitative agreement with Monte Carlo simulations is obtained. It is verified that two different coarsening mechanisms are predominant in the two systems--coarsening either by diffusion of single atoms or by movement of whole precipitates.
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Affiliation(s)
- Lorenz-M Stadler
- Fakultät für Physik, Institut für Materialphysik, Universität Wien, Strudlhofgasse 4, A-1090 Wien, Austria.
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14
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Fluerasu A, Sutton M, Dufresne EM. X-ray intensity fluctuation spectroscopy studies on phase-ordering systems. PHYSICAL REVIEW LETTERS 2005; 94:055501. [PMID: 15783659 DOI: 10.1103/physrevlett.94.055501] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2004] [Indexed: 05/24/2023]
Abstract
The order-disorder phase transition in Cu3Au has been studied by x-ray intensity fluctuation spectroscopy. Following a quench from the high-temperature, disordered phase, the ordering kinetics is well described by a universal scaling form that can be measured by time-resolved (incoherent) x-ray scattering. By using coherent scattering, we have measured the fluctuations about this universal scaling form. In the late stages of the ordering process, these fluctuations give a two-time correlation function C(q,t1,t2) which has a scaling form with natural variables deltat=/t1-t2/ and t =(t1+t2) / 2. The scaling form crosses over from linear in t to t1/2. These present the first such results for a nonconserved system.
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Affiliation(s)
- Andrei Fluerasu
- Department of Physics, McGill University, Montreal, Quebec, Canada H3A 2T8.
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