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Extremely well-isolated two-dimensional spin-1/2 antiferromagnetic Heisenberg layers with small exchange coupling in the molecular-based magnet CuPOF
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(2020) Extremely well-isolated two-dimensional spin-1/2 antiferromagnetic Heisenberg layers with small exchange coupling in the molecular-based magnet CuPOF. Physical Review B (Condensed Matter and Materials Physics), 102 (6). 064431. doi:10.1103/PhysRevB.102.064431 ISSN 1098-0121.
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Official URL: https://doi.org/10.1103/PhysRevB.102.064431
Abstract
We report on a comprehensive characterization of the newly synthesized Cu2+-based molecular magnet [Cu(pz)2(2−HOpy)2](PF6)2 (CuPOF), where pz=C4H4N2 and 2−HOpy=C5H4NHO. From a comparison of theoretical modeling to results of bulk magnetometry, specific heat, μ+SR, ESR, and NMR spectroscopy, this material is determined as an excellent realization of the two dimensional square-lattice S=12 antiferromagnetic Heisenberg model with a moderate intraplane nearest-neighbor exchange coupling of J/kB=6.80(5) K, and an extremely small interlayer interaction of about 1 mK. At zero field, the bulk magnetometry reveals a temperature-driven crossover of spin correlations from isotropic to XY type, caused by the presence of a weak intrinsic easy-plane anisotropy. A transition to long-range order, driven by the low-temperature XY anisotropy under the influence of the interlayer coupling, occurs at TN=1.38(2) K, as revealed by μ+SR. In applied magnetic fields, our 1H-NMR data reveal a strong increase of the magnetic anisotropy, manifested by a pronounced enhancement of the transition temperature to commensurate long-range order at TN=2.8 K and 7 T.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Nuclear magnetic resonance spectroscopy , Antiferromagnetism, Heisenberg uncertainty principle , Lattice theory, Anisotropy | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | |||||||||||||||||||||||||||||||||
Publisher: | American Physical Society | |||||||||||||||||||||||||||||||||
ISSN: | 1098-0121 | |||||||||||||||||||||||||||||||||
Official Date: | 1 August 2020 | |||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 102 | |||||||||||||||||||||||||||||||||
Number: | 6 | |||||||||||||||||||||||||||||||||
Article Number: | 064431 | |||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevB.102.064431 | |||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||
Access rights to Published version: | Closed Access | |||||||||||||||||||||||||||||||||
Copyright Holders: | © 2020 American Physical Society | |||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 3 August 2020 | |||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 4 August 2020 | |||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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