Alternating commensurate-incommensurate structures in the magnetic phase diagram of CsNiF3

Details Alternating commensurate-incommensurate structures in the magnetic phase diagram of CsNiF3 Alternating commensurate-incommensurate structures in the magnetic phase diagram of CsNiF3

1997-01-10

arxiv.org/abs/cond-mat/9701064v1

Physics

Condensed Matter

Statistical Mechanics

11 pages, LaTeX, 5 figures, sent to PRB Rapid Communication

Scientific paper

10.1103/PhysRevB.55.R3351

The magnetic phase diagram of the quasi one-dimensional spinchain system CsNiF$_3$ below the N\'eel temperature is determined. For magnetic fields perpendicular to the spin chains incommensurate phases are predicted. From linear spin-wave theory we obtain the instability line of the paramagnetic phase as a function of the strength and the direction of the field. The system undergoes a transition to a commensurate or an incommensurate phase depending on the direction of the magnetic field. In the commensurate phase the characterizing wave vector is locked to values describing a two-sublattice structure, whereas in the incommensurate phase the wave vector changes continuously between the corresponding two-sublattice wave vectors.

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