Study of Field-Induced Magnetic Order in Singlet-Ground-State Magnet CsFeCl$_3$

Details Study of Field-Induced Magnetic Order in Singlet-Ground-State Magnet CsFeCl$_3$ Study of Field-Induced Magnetic Order in Singlet-Ground-State Magnet CsFeCl$_3$

2004-07-08

arxiv.org/abs/cond-mat/0407196v2

Physics

Condensed Matter

Materials Science

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.71.224426

The field-induced magnetic order in the singlet-ground-state system CsFeCl$_3$ has been studied by measuring magnetization and neutron diffraction. The field dependence of intensity for the neutron magnetic reflection has clearly demonstrated that the field-induced ordered phase is described by the order parameter $$. A condensate growth of magnons is investigated through the temperature dependence of $M_z$ and $M_{\perp}$, and this ordering is discussed in the context of a magnon Bose-Einstein condensation. Development of the coherent state and the static correlation length has been observed in the incommensurate phase in the field region of $5 < H < 6$ T at 1.8 K. At $H > H_{\rm c}$, a satellite peak was found in coexistence with the commensurate peak at the phase boundary around 10 T, which indicates that the tilt of the c-axis would be less than $\sim 0.5^{\circ}$ in the whole experiments.

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