Exchange constants in molecule-based magnets derived from density functional methods

Lancaster, Tom (Durham University, UK); Clark, Stewart (Durham University, UK); Thomas, Iori (Durham University, UK)

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Exchange constants in molecule-based magnets derived from density functional methods Open Access

Cu(pyz)(NO3)2 is a quasi-one-dimensional molecular antiferromagnet that exhibits three-dimensional long-range magnetic order below T N = 110 mK due to the presence of weak interchain exchange couplings. Here, we compare calculations of the three largest exchange coupling constants in this system using two techniques based on plane-wave basis-set density functional theory: (i) a dimer fragment approach and (ii) an approach using periodic boundary conditions. The calculated values of the large intrachain coupling constant are found to be consistent with experiment, showing the expected level of variation between different techniques and implementations. However, the interchain coupling constants are found to be smaller than the current limits on the resolution of the calculations. This is due to the computational limitations on convergence of absolute energy differences with respect to basis set, which are larger than the interchain couplings themselves. Our results imply that errors resulting from such limitations are inherent in the evaluation of small exchange constants in systems of this sort, and that many previously reported results should therefore be treated with caution.

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Resource type: Dataset
Contributors: Creator: Lancaster, Tom ¹
Contact person: Lancaster, Tom ¹
Creator: Clark, Stewart ¹
Creator: Thomas, Iori ¹

¹ Durham University, UK
Funder: Engineering and Physical Sciences Research Council
Research methods
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Cited in: 10.1103/PhysRevB.96.094403
Identifier: ark:/32150/r2cv43nw81c
doi:10.15128/r2cv43nw81c
Publisher: Durham University
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