HEATING OF MAGNONS BY CHARGE-CARRIERS AND ELECTRICAL-PROPERTIES OF HGCR2SE4

Strong variations of the conductivity and the Hall coefficient as a fu nction of the magnetic and electric field strengths are discovered in the ferromagnetic semiconductor HgCr2Se4. The nature of these phenomen a is discussed in connection with its electronic structure and the str ong interaction between the electric and magnetic subsystems in this m agnetic semiconductor. The results can be interpreted within a model o f ordinary semiconductors with consideration of the strong electron-ma gmon interaction specific to magnetic semiconductors, the heating of m agnons by hot charge carriers, and the trapping of charge carriers (th e formation of ferrons) due to the s-d exchange interaction. (C) 1997 American Institute of Physics.