2014 The classical spin system with biquadratic exchange interaction and single spin anisotropy is analysed in the molecular field approximation. The temperature dependence of important thermodynamic quantities versus anisotropy strength is studied and the crossover from ordinary critical point behaviour to nematic point behaviour is discussed. The power-law parameters describing the temperatur...

In the past, the Callen–Callen (1965 Phys. Rev. 139 A455–71; 1966 J. Phys. Chem. Solids 27 1271–85) model has been highly successful in explaining the origin and temperature dependence of the magneto-crystalline anisotropy in many magnetic compounds. Yet, despite their high ordering temperatures of ∼650 K, the Callen–Callen model has proved insufficient for the REFe2 compounds. In this paper, w...

Lattice parameters, magnetization, thermal expansion and magnetostriction of a series of single crystal and polycrystalline specimens of Tb-Sc alloys have been measured. The various experimental observations are examined in terms of the single ion theory of Callen & Callen and the magnetoelastic energy evaluated for the various compositions.

40 I am honored to have been selected to deliver the Fourth Dr Abraham Horwitz Lecture. Dr Horwitz is a legend in the field of nutrition and a role model for many of us in the younger generation. I had the privilege of meeting Dr Horwitz two weeks ago in his home here in Washington. With the kind efforts of Alan Berg, we were able to see the cherry blossoms together. In India, we use the term d...