Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species

Curley, S. P. M.; Huddart, B. M.; Kamenskyi, D.; Coak, Matthew J.; Williams, Robert C.; Ghannadzadeh, Saman; Schneider, Annemarie; Okubo, Susumu; Sakurai, Takahiro; Ohta, H.; Tidey, Jeremiah P.; Graf, David; Clark, S. J.; Blundell, Stephen J.; Pratt, F. L.; Telling, Mark; Lancaster, Tom; Manson, Jamie L.; Goddard, Paul

doi:10.1103/physrevb.104.214435

Cited by 2 publications

(1 citation statement)

References 75 publications

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“…Apart from the aforementioned scenarios, a recent study on the magnetic properties of CuVOF 4 (H 2 O) 6 •H 2 O affords another unusual situation (Figure 5d). 42,43 In this compound, Cu is connected to V through a O bridge with a bond angle of 142.88°and the Cu(II)−V(IV) coupling is fitted into a dimer model with the fitted value of 1.81 meV. First-principles calculations reveal that the magnetic orbitals reside in the Jahn−Teller plane and a significant spin density at the bridging O atom leads to a quantum disordered state at low magnetic fields.…”

Section: ■ Introductionmentioning

confidence: 99%

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV₂” Fragment

et al. 2022

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The strength and sign of superexchange interactions are often predicted on the basis of the bond angles between magnetic ions, but complications may arise in situations with a nontrivial arrangement of the magnetic orbitals. We report on a novel molecular tetramer compound [Cu(H 2 O)dmbpy] 2 [V 2 O 2 F 8 ] (dmbpy = 4,4′-dimethyl-2,2′bipyridyl) that is composed of triangular "CuV 2 " fragments and displays a spin gap behavior. By combining first-principles calculations and electronic models, we reveal that superexchange Cu−V interactions carry drastically different coupling strengths along two Cu−F−V pathways with comparable bond angles in the triangular "CuV 2 " fragment. Counterintuitively, their strong disparity is found to originate from the restricted symmetry of the half-filled Cu d x 2 −y 2 orbital stabilized by the crystal field, leading to one dominating antiferromagnetic Cu−V coupling in each fragment. We revisit the magnetic properties of the reported spin-gapped chain compound [enH 2 ]Cu-(H 2 O) 2 [V 2 O 2 F 8 ] (enH 2 = ethylene diammonium) containing similar triangular "CuV 2 " fragments, and the magnetic behavior of the molecular tetramer and the chain compounds is rationalized as that of weakly coupled spin dimers and spin trimers, respectively. This work demonstrates that fundamentally different magnetic couplings can be observed between magnetic ions with similar bond angles in a single spin motif, thus providing a strategy to introduce various exchange interactions combined with low dimensionality in heterometallic Cu(II)−V(IV) compounds.

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Section: ■ Introductionmentioning

confidence: 99%

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV₂” Fragment

et al. 2022

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Magnetic twisting in an artificial ferrimagnet: Anisotropic magnetoresistance on Py/Gd/Py/Gd/Py/Si Nx multilayers

Zhang,

Niu,

Meng

et al. 2023

Phys. Rev. B

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Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species

Abstract: How to cite:Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 2 publications

References 75 publications

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV₂” Fragment

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV₂” Fragment

Magnetic twisting in an artificial ferrimagnet: Anisotropic magnetoresistance on Py/Gd/Py/Gd/Py/Si Nx multilayers

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Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species

Abstract: How to cite:Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 2 publications

References 75 publications

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV2” Fragment

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV2” Fragment

Magnetic twisting in an artificial ferrimagnet: Anisotropic magnetoresistance on Py/Gd/Py/Gd/Py/Si Nx multilayers

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Product

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Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV₂” Fragment

Two Distinct Cu(II)–V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “CuV₂” Fragment