Phys. Rev. Lett. 27, 1383–1385 (1971)Quadrupole Phase Transitions in Magnetic SolidsReceived 16 August 1971; published in the issue dated 15 November 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
PACS:
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