Direct measurement of spin correlations using magnetostriction

V. S. Zapf, V. F. Correa, P. Sengupta, C. D. Batista, M. Tsukamoto, N. Kawashima, P. Egan, C. Pantea, A. Migliori, J. B. Betts, M. Jaime, A. Paduan-Filho

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33 Scopus citations

Abstract

We demonstrate that the short-range spin correlator Si Sj, a fundamental measure of the interaction between adjacent spins, can be directly measured in certain insulating magnets. We present magnetostriction data for the insulating organic compound Ni Cl2 -4SC (N H2) 2, and show that the magnetostriction as a function of field is proportional to the dominant short-range spin correlator. Furthermore, the constant of proportionality between the magnetostriction and the spin correlator gives information about the spin-lattice interaction. Combining these results with the measured Young's modulus, we are able to extract dJ dz, the dependence of the superexchange constant J on the Ni interionic distance z.

Original languageEnglish
Article number020404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number2
DOIs
StatePublished - Jan 9 2008

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