Influence of Magnetic Order on Conduction Electrons and Phonons in Magnetic Semiconductors

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Abstract
Magnetic correlations influence the energy of conduction electrons through the exchange coupling. A magnetization leads to a splitting of the band where, however, the states of the higher band are unstable against spin‐flip with spin‐wave production. The rather unknown ion‐position dependence of the spin Hamiltonian couples the spins to the phonons. For weak spin‐spin couplings an adiabatic principle is assumed. The effect of spin order on the phonon frequency, on the infrared and Raman spectra, and the isotope effect of magnetic couplings is discussed.