MAGNETIC MEASUREMENTS ON CD1-XCRXTE AND ZN1-XCRXTE

We have investigated the magnetic properties of single-crystal Cd1-xCr xTe and Zn1-xCrxTe samples. The magnetization is anisotropic (similar to 7% for Zn1-xCrxTe and similar to 0.4% for Cd1-xCrxTe) with the (111 ) direction having the greatest value. We have found that the magnetic behavior in fields up to 6 T and temperatures between 1.5 and 324 K f or both systems is well described by a theoretical model with crystal field, Jahn-Teller, spin-orbit, and spin-spin terms including ligand f ield corrections to the spin-orbit and spin-spin parameters. Good agre ement was found between the experimental results and the theoretical c alculations for a Jahn-Teller splitting of 370 and 320 cm(-1) and effe ctive spin-orbit parameters of -49.9 and -59.4 cm(-1) for Cd1-xCrxTe a nd Zn1-xCrxTe, respectively. The key feature is an orbital singlet, S = 2 ground state with a small splitting (1.5 K for Cd1-xCrxTe and 12.4 K for Zn1-xCrxTe) of the m(s) states. (C) 1996 American Institute of Physics.