Exchange parameters of copper-based quasi-two-dimensional Heisenberg magnets measured using high magnetic fields and muon-spin rotation

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dc.creatorGoddard, P. A.
dc.creatorSingleton, J.
dc.creatorSengupta, P.
dc.creatorMcDonald, R. D.
dc.creatorLancaster, T.
dc.creatorBlundell, S. J.
dc.creatorPratt, F. L.
dc.creatorCox, S.
dc.creatorHarrison, N.
dc.creatorManson, J. L.
dc.creatorSoutherland, H. I.
dc.creatorSchlueter, J. A.
dc.date2008-03-28
dc.date.accessioned2026-07-07T09:29:11Z
dc.date.available2026-07-07T09:29:11Z
dc.descriptionPulsed-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 $B_{\rm c}$. Monte-Carlo simulations including a finite interlayer exchange energy $J_{\perp}$ quantitatively reproduce the data; the concavity indicates the effective dimensionality and $B_{\rm c}$ is an accurate measure of the in-plane exchange energy $J$. Using these values and Neél 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.
dc.identifierhttps://arxiv.org/abs/0803.4169
dc.identifierhttp://arxiv.org/abs/0803.4169
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/157694
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleExchange parameters of copper-based quasi-two-dimensional Heisenberg magnets measured using high magnetic fields and muon-spin rotation
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