Far-Infrared-Active Phonon Processes in CuCl

Hadni, A.; Bréhat, F.; Claudel, Jacques; Strimer, P.

doi:10.1063/1.1669851

Cited by 29 publications

(11 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optical frequencies at the point r, found previously by infrared absorption and reflectivity measurements, 4 agree with our neutron results to within 5%. The LA and TA phonons observed by Hadni et al 5 were confirmed to correspond to the point X in the reciprocal space.…”

mentioning

confidence: 58%

See 1 more Smart Citation

Normal Modes of Vibrations in CuCl

et al. 1971

View full text Add to dashboard Cite

The frequency-wave-vector dispersion relation v(q) for the normal vibrations of a CuCl single crystal at room temperature has been measured for the [100]-, [110]~, and [lllj-symmetric directions using inelastic neutron scattering.In view of the interest in studying the lattice dynamics of crystals with zinc-blende structure, we present in this paper the results of coherent inelastic neutron scattering on cuprous chloride (CuCl). Our particular attention was drawn by this material because of its peculiar behavior relative to other crystals with the same symmetry, as pointed out by Martin. 1 The present experiments were performed by means of the triple-axis crystal spectrometer at 400-300 '200H 100-the EL3 reactor, Saclay. A collimated beam of monochromatic neutrons, produced by Bragg reflection from a germanium single crystal, was incident upon the CuCl specimen. The energies of the scattered neutrons were determined by Bragg reflection from a second germanium single crystal. The experiments were carried out by using either constant-Q or constant-v techniques, for waves propagating along the high-symmetry directions [lOO], [llO], and [ill]. 200-r=15min jM50-100-50 H y>-const"anl-= 20cm" TA [&S]Q-consfar^ = 0.6

show abstract

mentioning

confidence: 58%

“…5 In this case the dependence of a on the atomic number Z of impurities can be expressed using the scattering phase shifts of the impurities that are, in turn, simply related to Z through the Friedel sum rule. It is generally accepted that in aluminum the 3d transition-metal impurities carry no magnetic moments.…”

Section: P(r) = (A/r 3 ) Cos(2£ F R + Cp)mentioning

confidence: 99%

Normal Modes of Vibrations in CuCl

et al. 1971

View full text Add to dashboard Cite

show abstract

“…20 In the range of overlap, our data are in agreement with Hadni etal. 21 and we invoke also phonon overtones to explain the wide shoulder between 70 and 100 meV. In the remaining energy window between 0.1 and 3 eV, the spectral dependence of K is flat, and K does not exceed 0.2 and 0.02 cm" 1 below and above 0.5 eV, respectively.…”

mentioning

confidence: 63%

Definite Experimental Evidence against Intrinsic Electron-Hole Superconductivity in Pure CuCl

Batlogg¹,

Remeika²

1980

Phys. Rev. Lett.

View full text Add to dashboard Cite

“…Early Raman measurements on CuCl indicated only the TO(γ ) and LO(γ ) mode [7], but later Raman experiments showed four peaks [8], displaying the activity of an additional lattice mode, observed also by IR spectroscopy [2]. This additional mode, labelled β [10], which is obviously a polar mode, has been observed in CuCl by Raman scattering [24], IR absorption [2][3][4][5] and reflection [2,6] as well as neutron scattering [29,30], from room temperature down to liquid helium temperature (see [20] and [24] for extensive references).…”

Section: Introductionmentioning

confidence: 96%

“…Cu halides exhibit an ionic conductive phase at high temperature, but at a low enough temperature they crystallize in the zinc-blende structure which is a non-conductive phase (γ phase). In this phase, a variety of anomalies are known to exist and they are especially pronounced in the phonon spectrum of both pure and mixed cuprous halides, whose lattice dynamical properties have been extensively studied for many years by infrared (IR) spectroscopy [1][2][3][4][5][6], Raman spectroscopy [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and neutron scattering [25][26][27][28][29][30], from room temperature down to liquid helium temperature.…”

Section: Introductionmentioning

confidence: 99%

Far-infrared reflectivity spectroscopy of cuprous chloride, cuprous bromide and their mixed crystals

Wyncke¹,

Bréhat²

2000

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The temperature dependence of the far-infrared reflectivity spectrum of CuCl, CuBr and CuCl1 - x Brx , in the zinc-blende structure, is reported over a wide temperature range (10-300 K). The analysis of the experimental data proves the activity of two polar lattice modes in both CuCl and CuBr: the expected lattice mode labelled and an additional lattice mode labelled . The present work displays, for the first time, the activity of three lattice modes in the far-infrared reflectivity spectrum of CuCl1 - x Brx , from room temperature down to liquid helium temperature. Side-bands due to two-phonon processes are observed in the low-frequency range of the reflectivity spectrum of both pure and mixed crystals. The phonon anomalies observed in both pure and mixed crystals are discussed and explained in agreement with the off-centre model.

show abstract

Far-Infrared-Active Phonon Processes in CuCl

Cited by 29 publications

References 6 publications

Normal Modes of Vibrations in CuCl

Normal Modes of Vibrations in CuCl

Definite Experimental Evidence against Intrinsic Electron-Hole Superconductivity in Pure CuCl

Far-infrared reflectivity spectroscopy of cuprous chloride, cuprous bromide and their mixed crystals

Contact Info

Product

Resources

About