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Phys. Rev. Lett. 27, 1383 - 1385 (1971)

Quadrupole Phase Transitions in Magnetic Solids

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H. H. Chen and Peter M. Levy
Department of Physics, New York University, Bronx, New York 10453

Received 16 August 1971

We have studied the phase transitions of magnetic systems with large biquadratic interactions in the molecular-field approximation. Quadrupole and dipole phase transitions occur at different temperatures whenever the biquadratic interactions are greater than the bilinear terms for effective spin interactions with S>~3 / 2. For isotropic or Ising-like interactions with S=1 there is only a quadrupole phase transition when the biquadratic interactions are larger.


©1971 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.27.1383
DOI: 10.1103/PhysRevLett.27.1383

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