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26 April 2024

» arxiv » 0803.4169

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Exchange parameters of copper-based quasi-two-dimensional Heisenberg magnets measured using high magnetic fields and muon-spin rotation
P.A. Goddard ; J. Singleton ; P. Sengupta ; R.D. McDonald ; T. Lancaster ; S.J. Blundell ; F.L. Pratt ; S. Cox ; N. Harrison ; J.L. Manson ; H.I. Southerland ; J.A. Schlueter ;
Date:	28 Mar 2008
Abstract:	Pulsed-field magnetization experiments (fields $B$ of up to 85 T and temperatures $T$ down to 0.4 K) are reported on nine organic Cu-based two-dimensional (2D) Heisenberg magnets. All compounds show a low-$T$ magnetization that is concave as a function of $B$, with a sharp ’’elbow’’ transition to a constant value at a field $B_{ m c}$. Monte-Carlo simulations including a finite interlayer exchange energy $J_{perp}$ quantitatively reproduce the data; the concavity indicates the effective dimensionality and $B_{ m c}$ is an accurate measure of the in-plane exchange energy $J$. Using these values and Ne’el temperatures measured by muon-spin rotation, it is also possible to obtain a quantitative estimate of $\|J_{perp}/J\|$. In the light of these results, it is suggested that in magnets of the form [Cu(HF$_2$)(pyz)$_2$]X, where X is an anion, the sizes of $J$ and $J_{perp}$ are controlled by the tilting of the pyrazine (pyz) molecule with respect to the 2D planes.
Source:	arXiv, 0803.4169
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