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Condensed Matter > Strongly Correlated Electrons

Title: Geometric frustration on the trillium lattice in a magnetic metal-organic framework

Abstract: In the dense metal-organic framework Na[Mn(HCOO)$_3$], Mn$^{2+}$ ions ($S=\frac{5}{2}$) occupy the nodes of a `trillium' net. We show that the system is strongly magnetically frustrated: the N\'eel transition is suppressed well below the characteristic magnetic interaction strength; short-range magnetic order persists far above the N\'eel temperature; and the magnetic susceptibility exhibits a pseudo-plateau at $\frac{1}{3}$-saturation magnetisation. A simple model of nearest-neighbour Heisenberg antiferromagnetic and dipolar interactions accounts quantitatively for all observations, including an unusual 2-$\mathbf k$ magnetic ground-state. We show that the relative strength of dipolar interactions is crucial to selecting this particular ground-state. Geometric frustration within the classical spin liquid regime gives rise to a large magnetocaloric response at low applied fields that is degraded in powder samples as a consequence of the anisotropy of dipolar interactions.
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Materials Science (cond-mat.mtrl-sci); Other Condensed Matter (cond-mat.other); Statistical Mechanics (cond-mat.stat-mech)
Cite as: arXiv:2012.10361 [cond-mat.str-el]
  (or arXiv:2012.10361v2 [cond-mat.str-el] for this version)

Submission history

From: Johnathan Bulled [view email]
[v1] Fri, 18 Dec 2020 17:06:39 GMT (784kb,D)
[v2] Thu, 17 Mar 2022 15:58:34 GMT (813kb,D)
[v3] Tue, 13 Dec 2022 17:24:09 GMT (814kb,D)

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