Spin Flop, Supersolids, and Bicritical and Tetracritical Points
Jun 17, 1974
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Abstract: (APS)
A scaling theory is introduced for bicritical points, such as antiferromagnetic spinflop points (with analogies to the upper λ point in He4), where two distinct critical lines meet. Experimentally testable predictions follow from renormalization-group calculations which indicate that the bicritical exponents should be Heisenberg like for systems with n≤3 components; the crossover exponent φ(≃1.25 for n=3) is directly observable. For n>3 an intermediate ("supersolid") low-temperature phase may appear, the bicritical point then becoming tetracritical.References(23)
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