High-Frequency Subsurface and Bulk Dynamics of Liquid Indium

Reichert, H.; Bencivenga, Filippo; Wehinger, Björn; Krisch, M.; Sette, F.; Dosch, H.

doi:10.1103/physrevlett.98.096104

Cited by 20 publications

(17 citation statements)

References 15 publications

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“…In addition, electronic transport in Si involves the scattering of electrons between conduction band valleys by largewavevector phonons [9], a process which is in turn influenced by varying the size of the crystal [10,11]. Because of these effects, the importance of the phonon dispersion in Si and related nanomaterials has long been recognized, leading to repeated experimental efforts to study phonons in nanoscale volumes [12][13][14].…”

mentioning

confidence: 99%

Thermal Diffuse Scattering as a Probe of Large-Wave-Vector Phonons in Silicon Nanostructures

et al. 2013

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Large-wave-vector phonons have an important role in determining the thermal and electronic properties of nanoscale materials. The small volumes of such structures, however, have posed significant challenges to experimental studies of the phonon dispersion. We show that synchrotron x-ray thermal diffuse scattering can be adapted to probe phonons with wave vectors spanning the entire Brillouin zone of nanoscale silicon membranes. The thermal diffuse scattering signal from flat Si nanomembranes with thicknesses from 315 to 6 nm, and a sample volume as small as 5 μm(3), has the expected linear dependence on the membrane thickness and also exhibits excess intensity at large wave vectors, consistent with the scattering signature expected from low-lying large-wave-vector modes of the membranes.

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confidence: 99%

Thermal Diffuse Scattering as a Probe of Large-Wave-Vector Phonons in Silicon Nanostructures

et al. 2013

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“…Levesque et al [12] obtained evidence for a second, rather slow decay of the memory function. Such a behaviour of M q (t) has been confirmed more recently in the analysis of inelastic X-Ray scattering data of liquid metals [5,[13][14][15] as well as pertinent simulations [5,16]. Although finding an appropriate fit function for the memory function is an efficient way to represent data on S(q, ω) (see, however, [17] for another efficient procedure) it does not comprise a theory, except for the evaluation of the moments.…”

Section: Introductionmentioning

confidence: 71%

Collective dynamics of simple liquids: A mode-coupling description

Schirmacher¹,

Sinn²

2008

Condens. Matter Phys.

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We use the mode-coupling theory (MCT), which has been highly successful in accounting for the anomalous relaxation behaviour near the liquid-to-glass transition, for describing the dynamics of monatomic (i.e. simple) liquids away from the glass formation regime. We find that the dynamical structure factor predicted by MCT compares well to experimental findings and results of computer simulations. The memory function exhibits a two-step decay as found frequently in experimental and simulation data. The long-time relaxation regime, in which the relaxation rate strongly depends on the density and is identified as the α relaxation. At high density this process leads the glass instability. The short-time relaxation rate is fairly independent of density.

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“…For 4.0 GPa, a 10% increase in the sound velocity (2895 ± 60 ms −1 ) is observed. Sound velocities at 1.7 and 3.0 GPa are about 15% higher than the adiabatic sound velocity [27] and about 10% higher than the longitudinal sound velocity at ambient pressure [25]. Damping can also be explained quantitatively with the mode coupling theory [13], by using S(Q) data from Waseda [28] at ambient pressure and 170 • C.…”

Section: Resultsmentioning

confidence: 99%

“…Different types of memory functions were used in the literature to explain the experimental momentum-resolved IXS spectra, e.g., three-exponential-decay functions accounting for thermal, structural, and microscopic relaxation processes [25] or a Maxwell-type frequency-dependent viscosity with a small non-relaxing part [11]. Detailed information on the dynamical properties of liquids can be found in the recent review article [10].…”

Section: Techniquementioning

confidence: 99%

Experimental aspects of inelastic X-ray scattering studies on liquids under extreme conditions (P-T)

Alataş

Sinn

Zhao

et al. 2008

GHPR

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In this study, collective excitations of liquid indium are studied just above the melting point at different pressures (1.7 GPa, 240 • C; 3.0 GPa, 300 • C; 4.0 GPa, 360 • C). The pressures and temperatures are achieved by the use of an externally heated diamond anvil cell. Clear evidence for the existence of propagating modes is observed from the dynamical structure factor at constant momentum transfer (Q) up to about 18 nm −1 . The reason for the observed high elastic-scattering background is identified, and its effects on the determination of elastic properties such as viscosity are discussed.

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High-Frequency Subsurface and Bulk Dynamics of Liquid Indium

Cited by 20 publications

References 15 publications

Thermal Diffuse Scattering as a Probe of Large-Wave-Vector Phonons in Silicon Nanostructures

Thermal Diffuse Scattering as a Probe of Large-Wave-Vector Phonons in Silicon Nanostructures

Collective dynamics of simple liquids: A mode-coupling description

Experimental aspects of inelastic X-ray scattering studies on liquids under extreme conditions (P-T)

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