Geometric Frustration on the Trillium Lattice in a Magnetic Metal-Organic Framework.
| Autor: | Bulled JM; Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom., Paddison JAM; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.; Churchill College, University of Cambridge, Storey's Way, Cambridge CB3 0DS, United Kingdom., Wildes A; Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France., Lhotel E; Institut Néel, 25 Avenue des Martyrs, 38042 Grenoble, France., Cassidy SJ; Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom., Pato-Doldán B; Department of Chemistry, University of Bergen, P.O. Box 7803, N-5020 Bergen, Norway., Gómez-Aguirre LC; Department of Fundamental Chemistry and CICA, Faculty of Sciences University of A Coruña, 15071 A Coruńña, Spain., Saines PJ; School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom., Goodwin AL; Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2022 Apr 29; Vol. 128 (17), pp. 177201. |
| DOI: | 10.1103/PhysRevLett.128.177201 |
| Abstrakt: | In the dense metal-organic framework Na[Mn(HCOO)_{3}], Mn^{2+} ions (S=5/2) occupy the nodes of a "trillium" net. We show that the system is strongly magnetically frustrated: the Néel transition is suppressed well below the characteristic magnetic interaction strength; short-range magnetic order persists far above the Néel temperature; and the magnetic susceptibility exhibits a pseudo-plateau at 1/3-saturation magnetization. A simple model of nearest-neighbor Heisenberg antiferromagnetic and dipolar interactions accounts quantitatively for all observations, including an unusual 2-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. |
| Databáze: | MEDLINE |
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