Cooperative Jahn-Teller Effect in Dysprosium Antimonide

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Abstract
We have analyzed the recent magneto‐thermal and elastic data on dysprosium antimonide. Within the framework of the molecular field approximation we fit the data by using a model Hamiltonian which contains besides the crystal field term, bilinear and biquadratic pair interactions and a strain coupling of the lattice to the magnetic ions. The softening of the elastic constant (1/2)(C11‐C12) above the transition at 9.5°K is due to a strain coupling. This coupling dominates over the remaining biquadratic pair interactions of comparable magnitudes but opposite signs. We determine the bilinear coupling by fitting the magneto‐thermal data below the ordering temperature. We find that in DySb the biquadratic coupling is as important as the bilinear.

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