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We investigate the magnetic properties of the monoclinic D-type$\rm{Er_2Si_2O_7}$ with a distorted honeycomb lattice using powder and singlecrystal neutron scattering techniques, as well as single crystal magnetisationmeasurements. The powder neutron diffraction shows that below the orderingtemperature, $T_{\rm N}=1.85$ K, the compound forms a ${\bf q}=0$antiferromagnetic structure with four sublattices. For $H \! \parallel \! a$,magnetisation measurements reveal a narrow, but clearly visible plateau at onethird of the magnetisation saturation value. The plateau's stabilisation isaccompanied by a significant increase of the magnetic unit cell, as themagnetic peaks with fractional indices are observed in single crystal neutrondiffraction experiments. At low-temperatures, the inelastic neutron scatteringmeasurements reveal the presence of low-energy dispersionless excitations.Their spectrum is sensitive to the applied field, it significantly softens onthe magnetisation plateau, and demonstrates the behaviour expected for anon-collinear Ising antiferromagnet away from the plateau.

Magnetic structure, excitations and field induced transitions in the honeycomb lattice $\rm{Er_2Si_2O_7}$