Arkadii P. Zhernov

Lattice constant and coefficient of linear thermal expansion of the silicon crystal. Influence of isotopic composition

The features of the temperature behavior of the lattice constant and the coefficient of thermal expansion of silicon crystals are analyzed in the bond-charge model. The coefficient of thermal expansion and the Gruneisen factor for the natural isotopic composition are described to reasonable quantitative accuracy. The influence of the isotopic composition on the value of the lattice constant is discussed in detail.

Localization of phonons and low-frequency sound attenuation in layered crystals

It is shown that specific interference processes emerging in an anharmonic layered lattice in the localization regime leads to a considerable renormalization of the reciprocal phonon lifetime. This mechanism may dominate over the standard anharmonic mechanism. The coefficient of low-frequency sound attenuation in an insulator with diagonal disorder is discussed.

Weak localization of low-frequency sound in a quasi-one-dimensional crystal

A study is made of the damping coefficient for sound in a dielectric chain crystal containing isotopic impurities at low temperatures T⩽0.1ΘD (ΘD is the Debye temperature). It is shown that in the case of strong disorder, effects due to weak localization of the phonon modes have a substantial influence on the propagation of sound.A study is made of the damping coefficient for sound in a dielectric chain crystal containing isotopic impurities at low temperatures T⩽0.1ΘD (ΘD is the Debye temperature). It is shown that in the case of strong disorder, effects due to weak localization of the phonon modes have a substantial influence on the propagation of sound.

Role of the magnetic scattering in the quadratic temperature dependence of Nd2−xCexCuO4−δ films in normal state

Abstract Temperature dependence of electroresistance ϱ(T) in normal state has been measured for electron superconductors Nd2−xCexCuO4−δ (x=0.12−0.20). Behavior of ϱ(T) is qualitatively explained by the magnetic scattering of carriers on antiferromagnetic spin correlations, which is responsible for the quadratic dependence of ϱ(T).