%0 Journal Article %1 PhysRevB.100.144442 %A Iakovleva, M. %A Janson, O. %A Grafe, H.-J. %A Dioguardi, A. P. %A Maeter, H. %A Yeche, N. %A Klauss, H.-H. %A Pascua, G. %A Luetkens, H. %A Möller, A. %A Büchner, B. %A Kataev, V. %A Vavilova, E. %D 2019 %I American Physical Society %J Phys. Rev. B %K b %N 14 %P 144442 %R 10.1103/PhysRevB.100.144442 %T Ground state and low-temperature magnetism of the quasi-two-dimensional honeycomb compound InCu$_2/3$V$_1/3$O$_3$ %U https://link.aps.org/doi/10.1103/PhysRevB.100.144442 %V 100 %X We report a combined 115In nuclear quadrupole resonance, 51V nuclear magnetic resonance, and muon spin-relaxation spectroscopic study of the low-temperature magnetic properties of InCu2/3V1/3O3, a quasi-two-dimensional (2D) compound comprising in the spin sector a honeycomb lattice of antiferromagnetically coupled spins S=1/2 associated with Cu2+ ions. Despite substantial experimental and theoretical efforts, the ground state of this material has not been ultimately identified. In particular, two characteristic temperatures of about 40 and 20 K manifesting themselves as anomalies in different magnetic measurements are discussed controversially. A combined analysis of the experimental data complemented with theoretical calculations of exchange constants enabled us to identify, below 39 K, an “intermediate” quasi-2D static spin state. This spin state is characterized by a staggered magnetization with a temperature evolution that agrees with the predictions for the 2D XY model. We observe that this state gradually transforms at 15 K into a fully developed 3D antiferromagnetic Néel state. We ascribe such an extended quasi-2D static regime to an effective magnetic decoupling of the honeycomb planes due to a strong frustration of the interlayer exchange interactions, which inhibits long-range spin-spin correlations across the planes. Interestingly, we find indications of the topological Berezinsky-Kosterlitz-Thouless transition in the quasi-2D static state of the honeycomb spin-1/2 planes of InCu2/3V1/3O3.

@article{PhysRevB.100.144442, abstract = {We report a combined 115In nuclear quadrupole resonance, 51V nuclear magnetic resonance, and muon spin-relaxation spectroscopic study of the low-temperature magnetic properties of InCu2/3V1/3O3, a quasi-two-dimensional (2D) compound comprising in the spin sector a honeycomb lattice of antiferromagnetically coupled spins S=1/2 associated with Cu2+ ions. Despite substantial experimental and theoretical efforts, the ground state of this material has not been ultimately identified. In particular, two characteristic temperatures of about 40 and 20 K manifesting themselves as anomalies in different magnetic measurements are discussed controversially. A combined analysis of the experimental data complemented with theoretical calculations of exchange constants enabled us to identify, below 39 K, an “intermediate” quasi-2D static spin state. This spin state is characterized by a staggered magnetization with a temperature evolution that agrees with the predictions for the 2D XY model. We observe that this state gradually transforms at 15 K into a fully developed 3D antiferromagnetic Néel state. We ascribe such an extended quasi-2D static regime to an effective magnetic decoupling of the honeycomb planes due to a strong frustration of the interlayer exchange interactions, which inhibits long-range spin-spin correlations across the planes. Interestingly, we find indications of the topological Berezinsky-Kosterlitz-Thouless transition in the quasi-2D static state of the honeycomb spin-1/2 planes of InCu2/3V1/3O3.}, added-at = {2019-11-14T15:12:21.000+0100}, author = {Iakovleva, M. and Janson, O. and Grafe, H.-J. and Dioguardi, A. P. and Maeter, H. and Yeche, N. and Klauss, H.-H. and Pascua, G. and Luetkens, H. and Möller, A. and Büchner, B. and Kataev, V. and Vavilova, E.}, biburl = {https://www.bibsonomy.org/bibtex/28217075e994c33c1a5cdd2ebb1be6f87/ctqmat}, day = 29, description = {Phys. Rev. B 100, 144442 (2019) - Ground state and low-temperature magnetism of the quasi-two-dimensional honeycomb compound ${\mathrm{InCu}}_{2/3}{\mathrm{V}}_{1/3}{\mathrm{O}}_{3}$}, doi = {10.1103/PhysRevB.100.144442}, interhash = {70aa1a6d2f5b415853cc76969e6c6a3c}, intrahash = {8217075e994c33c1a5cdd2ebb1be6f87}, journal = {Phys. Rev. B}, keywords = {b}, month = {10}, number = 14, numpages = {14}, pages = 144442, publisher = {American Physical Society}, timestamp = {2023-10-20T09:58:22.000+0200}, title = {Ground state and low-temperature magnetism of the quasi-two-dimensional honeycomb compound InCu$_{\mathbf{2/3}}$V$_{\mathbf{1/3}}$O$_{\mathbf{3}}$}, url = {https://link.aps.org/doi/10.1103/PhysRevB.100.144442}, volume = 100, year = 2019 }