I. INTRODUCTION The interaction of the atoms in a solid leads to the vibration of atoms around their equilibrium position and hence the lattice waves with various modes. Debye.analysed the energy of the lattice vibrat...
I. REVIEW ON THE LINDEMANN EQUATION The Debye temperature is an important physical property of metals both in the- ory and practice. According to Lindemann, the relationship between the Debye temperature θ(K) and the...
The complete Hamiltonian consists of an electron term, a phonon term and an electronphonon interaction term. Since the electron-phonon interaction in materials can be strong, we eliminate Hel-ph term by means of canon...
Ⅰ. INTRODUCTION The M(?)ssbauer recoil-free factor, f, is generally given by f=exp(—k^2〈X^2〉), (1) where k is the wave vector of gamma ray, and 〈x^2〉 is the mean square displacement of the atom due to its zero-p...
In the research of coherent interaction of laser plasma, the optical wave is usually assumed as a monochromatic plane wave.However, the laser light always has a finite frequency band width.Moreover,besides target expe...
Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski(?)ldine, widely scattered in a skarn belt. Synthetic MgSn(OH)6 was obtained many years ago and ...
Ⅰ. INTRODUCTIONIt has been shown experimentally that the electrical resistivity of A15 compounds like Nb3Sn, Nb3Al and Nb3Ge can well be described by the formula ρ=ρ0+αT2 over the temperature range from their Tc t...