Using magnetostriction to measure the spin-spin correlation function and magnetoelastic coupling in the quantum magnet NiCl$_2$-4SC(NH$_2$)$_2$

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dc.creatorZapf, V. S.
dc.creatorCorrea, V. F.
dc.creatorSengupta, P.
dc.creatorBatista, C. D.
dc.creatorTsukamoto, M.
dc.creatorKawashima, N.
dc.creatorEgan, P.
dc.creatorPantea, C.
dc.creatorMigliori, A.
dc.creatorBetts, J. B.
dc.creatorJaime, M.
dc.creatorPaduan-Filho, A.
dc.date2007-05-02
dc.date.accessioned2026-07-07T07:59:14Z
dc.date.available2026-07-07T07:59:14Z
dc.descriptionWe report a method for determining the spatial dependence of the magnetic exchange coupling, $dJ/dr$, from magnetostriction measurements of a quantum magnet. The organic Ni $S = 1$ system NiCl$_2$-4SC(NH$_2$)$_2$ exhibits lattice distortions in response to field-induced canted antiferromagnetism between $H_{c1} = 2.1$ T and $H_{c2} = 12.6$ T. We are able to model the magnetostriction in terms of uniaxial stress on the sample created by magnetic interactions between neighboring Ni atoms along the c-axis. The uniaxial strain is equal to $(1/E)dJ_c/dx_c < S_{\bf r} \cdot S_{{\bf r}+ {\bf e}_c} >$, where $E$, $J_c$, $x_c$ and ${\bf e}_c$ are the Young's modulus, the nearest neighbor (NN) exchange coupling, the variable lattice parameter, and the relative vector between NN sites along the c-axis. We present magnetostriction data taken at 25 mK together with Quantum Monte Carlo calculations of the NN spin-spin correlation function that are in excellent agreement with each other. We have also measured Young's modulus using resonant ultrasound, and we can thus extract $dJ_c/dx_c = 2.5$ K/$Å$, yielding a total change in $J_c$ between $H_{c1}$ and $H_{c2}$ of 5.5 mK or 0.25% in response to an 0.022% change in length of the sample.
dc.identifierhttps://arxiv.org/abs/0705.0365
dc.identifierhttp://arxiv.org/abs/0705.0365
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/128294
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleUsing magnetostriction to measure the spin-spin correlation function and magnetoelastic coupling in the quantum magnet NiCl$_2$-4SC(NH$_2$)$_2$
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