Phase diagram of antiferromagnetic cobalt fluoride |
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Authors: | E M Zavrazhnaya G K Chepurnykh |
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Institution: | (1) Institute of Applied Physics, National Academy of Sciences of Ukraine, Petropavlovskaya ul. 58, Sumy, 40030, Ukraine |
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Abstract: | The H-T phase diagram of antiferromagnetic cobalt fluoride in an external magnetic field H perpendicular to the easy magnetization axis A is completed and used to construct a phase diagram in the variables H z and H y . In this diagram, the lines corresponding to second-order phase transitions (between an angular phase and a phase with antiferromagnetic vector I ⊥ A) begin and end in fields of a spin-flip transition (i.e., in an exchange field). A peculiarity of these lines of phase transitions is that each of them has two tricritical points at which this line of second-order phase transitions transforms into a line of first-order phase transitions. A critical angle between the direction of the external magnetic field and the basal plane within which the first-order phase transition takes place is determined. |
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