Study of Elastic Properties and Their Pressure Dependence of Semi Magnetic Semiconductors(Condensed Matter: Structure, Mechanical and Thermal Properties)

概要

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A theoretical study of the elastic behavior in diluted magnetic semiconductors Zn_<1-x>Mn_xSe (x=0.016, 0.026 and 0.053) using a three-body interaction (TBI) caused by the electron-shell deformation of the overlapping ions is carried out. The estimated values of phase transition pressure and the vast volume discontinuity in pressure-volume (PV) phase diagram indicate the structural phase transition from zinc blende (B3) to rock salt (B1). The variation of second-order elastic constants with pressure resembles that observed in other compounds of zinc blende structure family. However, the inconsistency in the value of pressure derivative of theoretical and the experimental value of bulk modulus is attributed to the fact that we have derived our expressions neglecting thermal effects and assuming the overlap repulsion significant only up to nearest neighbors. The present approach has also succeeded in predicting the Born and relative stability criteria. It is revealed that interionic potential approach with emphasis on charge transfer effects predict the phase transition pressure and the pressure variation of elastic constants of other diluted magnetic semiconductors as well.
社団法人日本物理学会の論文
2005-01-15