Field-induced phases and magnetisation plateau in Er2Si2O7
We propose to investigate the excitations spectrum of the D-type Er2Si2O7 antiferromagnet in an applied magnetic field. Below the ordering temperature, T_N = 1.8 K, this compound with a distorted honeycomb lattice orders into a 4-sublattice antiferromagnetic structure. For a magnetic field applied along the a-axis, magnetisation at low temperatures shows a narrow, but clearly visible plateau at about a third of the saturation value. The origin of the plateau is currently unknown, however its stabilisation is accompanied by a significant increase of the magnetic unit cell. Our recent neutron diffraction experiments showed that new, non-integer magnetic peaks indexed as (0, k+1/2, l+1/2), (0, k+1/3, l) & (0, k+2/3, l), where k and l are integers, appeared in a narrow range of an applied field. Apart from determining the effective Hamiltonian of the system from the zero field-measurements, we are particularly interested in seeing how the excitation spectrum is affected by a transition into a plateau phase.
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PETRENKO Oleg; BALAKRISHNAN Geetha; M. Ciomaga Hatnean; ISLAM Manisha and OLLIVIER Jacques. (2021). Field-induced phases and magnetisation plateau in Er2Si2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1697
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