The temperature and magnetic field dependence of the elastic moduli of SmFe2 Laves phase compound has been investigated by means of an ultrasonic-pulse technique at a frequency of 10 MHz. The spin reorientation from the high-temperature easy direction of magnetization  to the low-temperature easy axis directed along , was observed to occur at Ts r=195°K. The behavior of the elastic moduli near Ts r suggests a first-order phase change. Applied magnetic fields strongly affect the temperature dependence and the absolute values of the elastic moduli of SmFe2. The elastic moduli increase significantly with increased magnetic fields, yielding a low and temperature-independent adiabatic compressibility. A remarkably high (42%) E effect was observed in SmFe2 at room temperature, 10-MHz ultrasonic frequency, and an applied magnetic field of 25 kOe. The magnetostriction of SmFe2 is high and negative. For a field of 25 kOe at room temperature and 77°K values are -2100 × 10-6 and -3340 × 10-6, respectively. The limiting value of the Debye temperatures were found to be 200 and 212°K, for the unmagnetized and at 25 kOe, respectively.
|Number of pages||5|
|Journal||Physical Review B|
|State||Published - 1 Jan 1974|
ASJC Scopus subject areas
- Condensed Matter Physics