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light and matter id / licht und materie id: infrared and raman spectra of non-metals (en Inglés)
H. Bilz
(Autor)
·
D. Strauch
(Autor)
·
L. Genzel
(Ilustrado por)
·
Springer
· Tapa Blanda
light and matter id / licht und materie id: infrared and raman spectra of non-metals (en Inglés) - Bilz, H. ; Genzel, L. ; Strauch, D.
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Reseña del libro "light and matter id / licht und materie id: infrared and raman spectra of non-metals (en Inglés)"
The dynamical properties of solids have recently attracted renewed interest in connection with the increasing understanding of phase transitions and re- lated phenomena. In particular, soft modes or, more generally, phonon 'anom- alies' seem to play an important role in structural and electronic phase tran- sitions, such as ferroelectric or superconducting transitions. The understanding of the mechanisms responsible for the occurrence of unusually low frequencies in phonon spectra requires a detailed analysis of the microscopic forces governing the lattice vibrations. Of particular importance is the influence of the electron- lattice interaction in the adiabatic approximation which in many cases is the origin of peculiarities in the phonon self-energy. In this work the vibrational spectra of pure non-metals and of those con- taining point defects are investigated. ' In these materials the interrelation be- tween the pseudo-harmonic forces (determining the phonon dispersion re- lations) and the non-linear anharmonic and electron-phonon forces (as they act in infrared and Raman spectra) is most obvious and can be quantitatively analysed in terms of appropriate models. The main task is to arrive at a physically correct treatment of electronic degrees of freedom, as for example in an electronic 'shell' model, which leads to the description of phonon spectra in terms of long-range polarizabilities and short-range deformabilities. The pur- pose of our review is to stimulate further investigations which, we hope, will result in explicit relations between the parameters of the semi-microscopic models and the matrix elements from the electronic band structure.
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