Meistverkauft in Sonstige
Hier sparen: Sonstige
- EUR 11,98Preistendenz: EUR 12,70
- EUR 34,26Preistendenz: EUR 37,91
- EUR 11,26Preistendenz: EUR 12,06
- EUR 23,04Preistendenz: EUR 24,32
- EUR 20,79Preistendenz: EUR 21,40
- EUR 20,99Preistendenz: EUR 24,91
- EUR 11,63Preistendenz: EUR 12,99
Über dieses Produkt
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.
- AutorD. Strauch,H. Bilz,R. K. Wehner
- HerausgaberL. Genzel
- AusgabeSoftcover reprint of the original 1st ed. 1984.
- Seiten602 Seiten
- Gewicht1051 g