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“Structure and phase transitions in C60 and C70 fullerites”. Van Tendeloo G, Muto S, van Heurck C, Amelinckx S, , 476 (1992)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
Times cited: 1
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“Oxygen ordering and critical temperature plateaus in ABa2Cu3O7-d (A=Er, Nd, Sm, Yb), pp”. Zou H, Krekels T, Van Tendeloo G, Wagener G, Buchgeister M, Hosseini SM, Kopitzki K, , 278 (1992)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“The selective imaging of “substructures&rdquo, in the mixed layer compounds Ca0.85CuO2 and (Ca,Sr)14Cu24O41”. Amelinckx S, Milat O, Van Tendeloo G, , 240 (1992)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“New orientationally ordered low-temperature superstructure in high-purity C60”. Van Tendeloo G, Amelinckx S, Verheijen MA, van Loosdrecht PHM, Meijer G, Physical review letters 69, 1065 (1992)
Abstract: http://dx.doi.org/doi:10.1103/PhysRevLett.69.1065
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 7.512
Times cited: 69
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“Structural instabilities associated with phase transitions: an electron microscopy study”. Van Tendeloo G, Schryvers D, Tanner LE, , 107 (1992)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
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“Displacive and diffusive components in the formation of the Ni2Al structure studied by HREM, SAED and micro-ED”. Muto S, Merk N, Schryvers D, Tanner LE, Monterey Institute for Advances Studies , 101 (1992)
Keywords: A3 Journal article; Electron microscopy for materials research (EMAT)
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“Structural variants of Ca0.85CuO2(Ca5+xCu6O12)”. Milat O, Van Tendeloo G, Amelinckx S, Babu TGN, Greaves C, Journal of solid state chemistry 101, 92 (1992). http://doi.org/10.1016/0022-4596(92)90205-A
Abstract: The structure of Ca0.85CuO2 was reexamined by means of electron diffraction and electron microscopy using the newly developed method of selective imaging in intergrowth structures in which the two substructures are based on different sublattices. The results of previous work are confirmed. Moreover, it is shown that two stacking variants and their twin related structures occur in the calcium substructure. The copper-oxygen substructure occurs in one variant only; it is often modulated by the various calcium arrangements, leading to phase disorder in its modulation pattern. It is shown that the ribbons of CuO4 clusters are presumably tilted with respect to the (010) plane.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.133
Times cited: 10
DOI: 10.1016/0022-4596(92)90205-A
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“Streaming-to-accumulation transition in a 2-dimensional electron-system in a polar semiconductor”. Xu W, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics 46, 7571 (1992). http://doi.org/10.1103/PhysRevB.46.7571
Abstract: Hot-electron transport is studied for a two-dimensional electron gas coupled to longitudinal-optical phonons in crossed electric and magnetic fields. At low electric and high magnetic fields the electrons are accumulated, while at high electric fields they are in a streaming state. We develop a streaming-to-accumulation transition model and compare the results with that from a Monte Carlo simulation.
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Impact Factor: 3.736
Times cited: 13
DOI: 10.1103/PhysRevB.46.7571
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“Streaming-to-accumulation transition in a two-dimensional electron system in a polar semiconductor”. Wen X, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics 46, 7571 (1992). http://doi.org/10.1103/PhysRevB.46.7571
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Impact Factor: 3.736
Times cited: 13
DOI: 10.1103/PhysRevB.46.7571
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“Electrical and thermal-properties of a 2-dimensional electron-gas in a one-dimensional periodic potential”. Peeters FM, Vasilopoulos P, Physical review : B : condensed matter and materials physics 46, 4667 (1992). http://doi.org/10.1103/PhysRevB.46.4667
Abstract: We investigate the influence of a periodic weak modulation along the x direction on the electrical and thermal properties of a two-dimensional electron gas in the presence of a perpendicular magnetic field. The modulation lifts the degeneracy of the Landau levels and leads to one-dimensional magnetic bands whose bandwidth oscillates as a function of the magnetic field. At weak magnetic fields this gives rise to the Weiss oscillations in the magnetoresistance, discovered recently, which have a very weakly temperature-dependent amplitude and a period proportional to square-root n(e), when n(e) is the electron density. Diffusion-current contributions, proportional to the square of the bandwidth, dominate rho(xx), and collisional contributions, varying approximately as the square of the density of states, dominate rho(yy). The result is that rho(xx) and rho(yy) oscillate out of phase as observed. Asymptotic analytical expressions are presented for the conductivity tensor. Similar oscillations, of much smaller amplitude, occur in the thermodynamic quantities, such as the magnetization, the susceptibility, and the specific heat. We also predict oscillations in the Hall resistance, the cyclotron resonance position, the linewidth, as well as in the thermal conductivity and thermopower. The components of the thermal-resistance tensor have a magnetic-field dependence similar to that of the electrical-resistivity tensor.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.736
Times cited: 148
DOI: 10.1103/PhysRevB.46.4667
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“Electrical and thermal properties of a two-dimensional electron gas in a one-dimensional periodic potential”. Peeters FM, Vasilopoulos P, Physical review: B 46, 4667 (1992). http://doi.org/10.1103/PhysRevB.46.4667
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 3.736
Times cited: 148
DOI: 10.1103/PhysRevB.46.4667
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“On the asymmetric next-nearest-neighbor ising model of oxygen ordering in YBa2Cu3Oz”. de Fontaine D, Asta M, Ceder G, McCormack R, Van Tendeloo G, Europhysics letters 19, 229 (1992). http://doi.org/10.1209/0295-5075/19/3/013
Abstract: Basic results concerning oxygen ordering in the superconducting compound YBa2Cu3Oz are briefly summarized. It is shown that, at equilibrium, only infinite-chain structures can be stabilized and those models based on hypothetical (and actually nonphysical) screened Coulomb interactions cannot produce stable ground states. It is suggested that diffraction data (neutrons, X-rays, electrons) from oxygen-lean samples are indicative of metastable displacive transformations, and are not directly related to oxygen ordering.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.095
Times cited: 33
DOI: 10.1209/0295-5075/19/3/013
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“The modulated structure of Ca.85CuO2 as studied by means of electron diffraction and microscopy”. Milat O, Van Tendeloo G, Amelinckx S, Babu TGN, Greaves C, Journal of solid state chemistry 97, 405 (1992). http://doi.org/10.1016/0022-4596(92)90050-6
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.133
Times cited: 15
DOI: 10.1016/0022-4596(92)90050-6
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“Strong-coupling analysis of large bipolarons in 2 and 3 dimensions”. Verbist G, Smondyrev MA, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics 45, 5262 (1992). http://doi.org/10.1103/PhysRevB.45.5262
Abstract: In the limit of strong electron-phonon coupling, we use either a Pekar-type or an oscillator wave function for the center-of-mass coordinate and either a Coulomb or an oscillator wave function for the relative coordinate, and are able to reproduce all the results from the literature for the large-bipolaron binding energy. Lower bounds are constructed for the critical ratio eta(c) of dielectric constants below which bipolarons can exist. It is found that, in the strong-coupling limit, the stability region for bipolaron formation is much larger in two dimensions (2D) than in 3D. We introduce a model that combines the averaging of the relative coordinate over the asymptotically best wave function with a path-integral treatment of the center-of-mass motion. The stability region for bipolaron formation is increased compared with the full path-integral treatment at large values of the coupling constant alpha. The critical values are alpha(c) almost-equal-to 9.3 in 3D and alpha(c) almost-equal-to 4.5 in 2D. Phase diagrams for the presented models are also obtained in both 2D and 3D.
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Impact Factor: 3.736
Times cited: 68
DOI: 10.1103/PhysRevB.45.5262
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“Strong-coupling analysis of large bipolarons in two and three dimensions”. Verbist G, Smondyrev MA, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics 45, 5262 (1992). http://doi.org/10.1103/PhysRevB.45.5262
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Impact Factor: 3.736
Times cited: 68
DOI: 10.1103/PhysRevB.45.5262
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“Infrared-spectroscopy of subbands, minibands, and donors in GaAs/AlGaAs superlattices”. Helm M, Peeters FM, de Rosa F, Colas E, Harbison JP, Florez LT, Surface science : a journal devoted to the physics and chemistry of interfaces
T2 –, 9TH INTERNATIONAL CONF ON THE ELECTRONIC PROPERTIES OF TWO-DIMENSIONAL, SYSTEMS ( EP2DS-9 ) / 5TH INTERNATIONAL CONF ON MODULATED SEMICONDUCTOR, STRUCTURES ( MSS-5 ), JUL 263, 518 (1992). http://doi.org/10.1016/0039-6028(92)90400-Z
Abstract: A far-infrared absorption study of electrons in lightly-doped GaAs/Al0.3Ga0.7As superlattices is presented. Both weakly and strongly coupled superlattices are investigated, and the difference between intersubband transitions and transitions between extended minibands is demonstrated. At low temperatures, the absorption spectra are dominated by donor transitions. The 1s-2p(z) transition, which is intimately related to the intersubband transition, is observed. All experimental data are compared to an envelope function calculation for the miniband structure and a variational calculation for the donor energies. Excellent agreement between experiment and theory is achieved.
Keywords: A1 Journal article; Condensed Matter Theory (CMT)
Impact Factor: 1.925
Times cited: 5
DOI: 10.1016/0039-6028(92)90400-Z
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“Extended stability region for large bipolarons through interaction with multiple phonon branches”. Verbist G, Peeters FM, Devreese JT, Ferroelectrics 130, 27 (1992). http://doi.org/10.1080/00150199208019532
Abstract: The large (bi)polaron is investigated for the case where the electron interacts with multiple LO-phonon branches. Explicit expressions for the groundstate energy and the effective mass are obtained within the Feynman polaron model approximation and they are applied to the material SrTiO3. The results of an effective LO-phonon branch approximation are compared with the results in which all LO-phonon branches are explicitly included. We show how the stability region for large bipolaron formation is enlarged when the electrons interact with multiple LO-phonon branches. The possible relevance of this result for the high-T(c) superconductors is pointed out.
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Impact Factor: 0.469
Times cited: 19
DOI: 10.1080/00150199208019532
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“Ortho-II structure in ABa2Cu3O7-\delta compounds (A=Er, Nd, Pr, Sm, Yb)”. Krekels T, Zou H, Van Tendeloo G, Wagener D, Buchgeister M, Hosseini SM, Herzog P, Physica: C : superconductivity 196, 363 (1992). http://doi.org/10.1016/0921-4534(92)90458-O
Abstract: Oxygen ordering has been investigated in superconducting ABa2Cu3O7-delta ceramic materials with A = Er, Nd, Sm and Yb, as well as in samples of this type with the rate earth A partially substituted by Pr. The critical temperature T(c) was determined as a function of the oxygen deficiency-delta of the compound and the corresponding microstructures were investigated by electron diffraction and electron microscopy. A distinct relationship exists between the width of the 60 K plateau and the ortho II ordering. Our results show that the ortho II ordered phase is the superconducting phase with a characteristic T(c) of 60 K.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.942
Times cited: 52
DOI: 10.1016/0921-4534(92)90458-O
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“Dispersion of longitudinal plasmons for a quasi-two-dimensional electron gas”. Backes WH, Peeters FM, Brosens F, Devreese JT, Physical review : B : condensed matter and materials physics 45, 8437 (1992). http://doi.org/10.1103/PhysRevB.45.8437
Abstract: Confinement of electrons in ultrathin metallic films leads to subbands. By increasing the thickness of the electron layer, the subbands will dissolve into a quasicontinuum, with the number of electrons per unit volume kept constant. Within the random-phase approximation, the two-dimensional plasmon, which originally follows Stern's dispersion relation, becomes a longitudinal surface plasmon. The plasmon excitations of a model metallic film are investigated by including all subbands. Single-particle excitations, which exhibit the depolarization shift, converge into the plasma excitation spectrum. With further increases in the film thickness, the bulk plasmon arises and the surface plasmon remains. Our analysis shows how quantum size effects evolve into hydrodynamical classical size effects with increasing thickness of the film.
Keywords: A1 Journal article; Condensed Matter Theory (CMT); Theory of quantum systems and complex systems
Impact Factor: 3.736
Times cited: 37
DOI: 10.1103/PhysRevB.45.8437
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“Spectrum evaluation”. van Espen P, Janssens K (1992).
Keywords: H3 Book chapter; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Chemometrics (Mitac 3)
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“Prediction of the optical characteristics and analytical qualities of an X-ray fluorescence microprobe at the European Synchrotron Radiation Facility (Grenoble)”. van Langevelde F, Janssens KH, Adams FC, Vis RD, Nuclear instruments and methods in physics research : A: accelerators, spectrometers, detectors and associated equipment 317, 383 (1992). http://doi.org/10.1016/0168-9002(92)90632-E
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1016/0168-9002(92)90632-E
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“Comparison of synchrotron X-ray microanalysis with electron and proton microscopy for individual particle analysis”. Janssens KH, Adams FC, van Langevelde F, Vis RD, Jones KW, Rivers M, Sutton S, Advances in X-ray analysis 35, 1265 (1992)
Keywords: A3 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Analysis of individual microscopic particles by means of synchrotron radiation induced X-ray micro fluorescence”. Janssens K, Adams F, Rivers ML, Jones KW, Proceedings 27th MAS (1992)
Keywords: P3 Proceeding; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“X-ray spectrometry”. Török SB, Van Grieken RE, Analytical chemistry 64r, 180 (1992)
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Electron microprobe characterization of individual aerosol particles collected by aircraft above the Southern Bight of the North Sea”. Rojas CM, Van Grieken RE, Atmospheric environment : an international journal 26a, 1231 (1992). http://doi.org/10.1016/0960-1686(92)90384-W
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1016/0960-1686(92)90384-W
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“Characterization of individual giant aerosol particles above the North Sea”. van Malderen H, Rojas C, Van Grieken R, Environmental science and technology 26, 750 (1992). http://doi.org/10.1021/ES00028A013
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1021/ES00028A013
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“Laser microprobe mass analysis of individual North Sea aerosol particles”. Dierck I, Michaud D, Wouters L, Van Grieken R, Environmental science and technology 26, 802 (1992). http://doi.org/10.1021/ES00028A021
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
DOI: 10.1021/ES00028A021
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“Atmosferische fluxen van zware metalen naar de Noordzee”. Otten P, Injuk J, Rojas C, Van Grieken R, Het ingenieursblad 61, 41 (1992)
Keywords: A3 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Atmosferische fluxen van zware metalen naar de Noordzee”. Otten P, Injuk J, Rojas C, Van Grieken R, De ingenieur 5, 32 (1992)
Keywords: A3 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
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“Size-differentiated composition of aerosols in Khartoum, Sudan”. Eltayeb MAH, van Espen PJ, Cafmeyer J, Van Grieken RE, Maenhaut W, The science of the total environment 120, 281 (1992). http://doi.org/10.1016/0048-9697(92)90062-W
Keywords: A1 Journal article; AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation); Chemometrics (Mitac 3)
DOI: 10.1016/0048-9697(92)90062-W
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