Raman Scattering by Optical Modes of Metals

Feldman, D. W.; Parker, James; Ashkin, M.

doi:10.1103/physrevlett.21.607

Cited by 64 publications

(26 citation statements)

References 6 publications

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“…12 We measured the Raman phonon energy to be 453.7 cm -1 at ambient pressure. This differs somewhat with the measurement of Olijnyk (457 cm -1 ), 12 but is consistent the studies of Feldman et al 33 (455 cm -1 ). It is important to note that Olijnyk and Jephcoat used the 514.5 nm laser line for Raman excitation, while our studies and those of Feldman used the 488 nm line.…”

Section: Analysis and Resultssupporting

confidence: 91%

X-ray diffraction and Raman studies of beryllium: Static and elastic properties at high pressures

et al. 2005

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We report combined x-ray and Raman studies of beryllium in helium or argon pressure medium at pressures approaching 200 GPa. Our results are generally consistent with recent studies confirming the stability of the hexagonal close-packed phase to the highest pressures. However, the quasi-hydrostatic conditions of our studies lead to a stiffer equation of state (K 0 =109.88, K 0 '=3.59) and a gradual approach toward a more ideal c/a ratio of 1.60 at 180 GPa. Combining our Raman and EOS data, we are able to evaluate the pressure dependence of the elastic shear modulus (We discuss the comparison of our results with measurements using ultrasonic and dynamic techniques.

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Section: Analysis and Resultssupporting

confidence: 91%

X-ray diffraction and Raman studies of beryllium: Static and elastic properties at high pressures

et al. 2005

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“…We calculated the phonon spectra of Be at hcp phase under compression. The calculated results agree well with the available values obtained from inelastic neutron scattering [39,40] and Raman scattering [42,41,10,13]. As listed in Table 2, the calculated frequency of the zone-center transverse optical (TO) phonon mode at 0 GPa is 453.6 cm −1 , which is consistent with the measured Raman phonon frequency 453.7 cm −1 at ambient pressure [13].…”

Section: Phonon Anomalysupporting

confidence: 88%

Novel R3¯m phase of beryllium under high pressure

Qiu

et al. 2015

Physics Letters A

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“…Our calculated electronic band structure is in good agreement with experimental results. The highest zone-center optical phonon mode compares very well with Raman scattering data [7,8]. Finally, we present schematic egiendisplacements of vectors representating selected phonon modes at the symmetry points.…”

mentioning

confidence: 78%

“…To the best of our knowledge, vibrational properties of this material have not been studied by using ab initio pseudopotential method. Only Raman-scattering experiment technique [7,8] has been used to measure the highest zone-center phonon frequency. In this paper, we report the electronic band structure, phonon dispersion curves and density of states of AuAl 2 .…”

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confidence: 99%

First‐principles study of electronic and dynamical properties of AuAl ₂

Tütüncü¹,

Altuntaş²,

Srivastava³

et al. 2004

phys. stat. sol. (c)

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We present an ab initio pseudopotential study within the local density functional approximation of the structural and electronic properties of AuAl2. The calculated lattice constant and electronic structure are in good agreement with recent experimental results. Using the density-functional perturbation theory, the phonon spectrum and density of states for this material are calculated. The highest optical phonon mode compares very well with a Raman scattering data at the zone-center. We also analize the atomic displacement patterns of selected acoustic and optical phonon mode at the symmetry points. IntroductionOver the past few years, binary intermetallic compounds that crystallize in the cubic fluorite structure (CaF 2 ) have received considerable attention, due to their fundamental and technological importance. Many of these compounds have been demonstrated to be superconducting at low temperatures [1]. Moreover, they can be used to study the transition-metal 5 d bands, since group-III elements affect only s-p states to the valance band. In particular, AuAl 2 is an excellent choice for selective solar absorber [2]. Several attempts have been made to investigate the structural and electronic properties of AuAl 2 . On the experimental side, the electronic structure of this material has been obtained by X-ray [3] and ultraviolet [4] photoemission spectroscopic experiments, optical reflectivity measurements [5], and angle-resolved photoemission spectroscopic (ARPES) [6]. Besides these experimental studies, all-electron full-potential linear augmented-plane-wave method [6] has been used to calculate the electronic structure of AuAl 2 .A wide variety of physical properties of solids depend on their phonon properties: specific heats, thermal expansion, and heat conduction; the electron-phonon interaction plays an important role in the resistivity of metals and superconductivity. To the best of our knowledge, vibrational properties of this material have not been studied by using ab initio pseudopotential method. Only Raman-scattering experiment technique [7,8] has been used to measure the highest zone-center phonon frequency. In this paper, we report the electronic band structure, phonon dispersion curves and density of states of AuAl 2 . The band structure is obtained from the application of the plane-wave pseudopotential method, within the local density approximation. These results are used, within a linear-response approach, to calculate the phonon dispersion curves and the density-of-states. Our calculated electronic band structure is in good agreement with experimental results. The highest zone-center optical phonon mode compares very well with Raman scattering data [7,8]. Finally, we present schematic egiendisplacements of vectors representating selected phonon modes at the symmetry points.

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Raman Scattering by Optical Modes of Metals

Cited by 64 publications

References 6 publications

X-ray diffraction and Raman studies of beryllium: Static and elastic properties at high pressures

X-ray diffraction and Raman studies of beryllium: Static and elastic properties at high pressures

Novel R3¯m phase of beryllium under high pressure

First‐principles study of electronic and dynamical properties of AuAl ₂

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Raman Scattering by Optical Modes of Metals

Cited by 64 publications

References 6 publications

X-ray diffraction and Raman studies of beryllium: Static and elastic properties at high pressures

X-ray diffraction and Raman studies of beryllium: Static and elastic properties at high pressures

Novel R3¯m phase of beryllium under high pressure

First‐principles study of electronic and dynamical properties of AuAl 2

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First‐principles study of electronic and dynamical properties of AuAl ₂