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arXiv · 1106.0654

Coexistence of the long-range and short-range magnetic order components in SrEr$_2$O$_4$

T. J. Hayes·G. Balakrishnan·P. P. Deen·P. Manuel·L. C. Chapon·O. A. Petrenko
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Abstract

Single crystal neutron diffraction reveals two distinct components to the magnetic ordering in geometrically frustrated SrEr$_2$O$_4$. One component is a long-range ordered ${\bf k}=0$ structure which appears below $T_N = 0.75$ K. Another component is a short-range incommensurate structure which manifests itself by the presence of a strong diffuse scattering signal. On cooling from higher temperatures down to 0.06 K, the partially ordered component does not undergo a pronounced phase transition. The magnetic moments in the long-range commensurate and short-range incommensurate structures are predominantly pointing along the [001] and [100] axes respectively. The unusual coexistence of two magnetic structures is probed using both unpolarised and XYZ-polarised neutron scattering techniques. The observed diffuse scattering pattern can be satisfactorily reproduced with a classical Monte Carlo simulation by using a simple model based on a ladder of triangles.

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T. J. Hayes, G. Balakrishnan, P. P. Deen, P. Manuel, L. C. Chapon, O. A. Petrenko. 2011-06-03. Coexistence of the long-range and short-range magnetic order components in SrEr$_2$O$_4$. https://doi.org/10.1103/physrevb.84.174435

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