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arXiv · 1407.1341

Disorder from order among anisotropic next-nearest-neighbor Ising spin chains in SrHo$_2$O$_4$

J. -J. Wen·W. Tian·V. O. Garlea·S. M. Koohpayeh·T. M. McQueen·H. -F. Li·J. -Q. Yan·J. A. Rodriguez-Rivera·D. Vaknin·C. L. Broholm
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Abstract

We describe why Ising spin chains with competing interactions in $\rm SrHo_2O_4$ segregate into ordered and disordered ensembles at low temperatures ($T$). Using elastic neutron scattering, magnetization, and specific heat measurements, the two distinct spin chains are inferred to have N\'eel ($\uparrow\downarrow\uparrow\downarrow$) and double-N\'eel ($\uparrow\uparrow\downarrow\downarrow$) ground states respectively. Below $T_\mathrm{N}=0.68(2)$~K, the N\'eel chains develop three dimensional (3D) long range order (LRO), which arrests further thermal equilibration of the double-N\'eel chains so they remain in a disordered incommensurate state for $T$ below $T_\mathrm{S}= 0.52(2)$~K. $\rm SrHo_2O_4$ distills an important feature of incommensurate low dimensional magnetism: kinetically trapped topological defects in a quasi$-d-$dimensional spin system can preclude order in $d+1$ dimensions.

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J. -J. Wen, W. Tian, V. O. Garlea, S. M. Koohpayeh, T. M. McQueen, H. -F. Li, J. -Q. Yan, J. A. Rodriguez-Rivera, D. Vaknin, C. L. Broholm. 2014-07-04. Disorder from order among anisotropic next-nearest-neighbor Ising spin chains in SrHo$_2$O$_4$. https://doi.org/10.1103/physrevb.91.054424

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