Quantum Spin Correlations in an Organometallic Alternating-Sign Chain

M. B. Stone, W. Tian, M. D. Lumsden, G. E. Granroth, D. Mandrus, J.-H. Chung, N. Harrison, and S. E. Nagler

Phys. Rev. Lett. 99, 087204 – Published 24 August 2007

Abstract

High resolution neutron scattering is used to study excitations in the organometallic magnet $({CH}_{3})_{2} {NH}_{2} {CuCl}_{3}$ ( ${DMACuCl}_{3}$ ). Combined with bulk magnetization and susceptibility studies, the new results imply that ${DMACuCl}_{3}$ is a realization of the $S = 1 / 2$ alternating antiferromagnetic-ferromagnetic (AFM-FM) chain. Coupled-cluster calculations indicate that the AFM and FM interactions have nearly the same strength, while analysis of scattering intensities shows evidence for interdimer spin correlations. Results are discussed in the context of recent ideas concerning quantum entanglement.

Received 3 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.087204

Authors & Affiliations

M. B. Stone¹, W. Tian^2,3, M. D. Lumsden¹, G. E. Granroth¹, D. Mandrus⁴, J.-H. Chung^5,6, N. Harrison⁷, and S. E. Nagler¹

¹Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
³Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
⁴Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁵NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁶Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
⁷National High Magnetic Field Laboratory, LANL, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 99, Iss. 8 — 24 August 2007

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