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arXiv · 0706.4480

Quantum Projection in an Ising Spin Liquid

D. M. Silevitch·C. M. S. Gannarelli·A. J. Fisher·G. Aeppli·T. F. Rosenbaum
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Abstract

A transverse magnetic field is used to scan the diagonal and off-diagonal susceptibility of the uniaxial quantum magnet, $\text{LiHo}_{0.045}\text{Y}_{0.955}\text{F}_4$. Clusters of strongly-coupled spins act as the primary source for the response functions, which result from a field-induced quantum projection of the system into a classically forbidden (meaning non-Ising) regime. Calculations based on spin pairs reproduce only some features of the data and fail to predict the measured off-diagonal response, providing evidence of a multi-spin collective state.

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D. M. Silevitch, C. M. S. Gannarelli, A. J. Fisher, G. Aeppli, T. F. Rosenbaum. 2007-08-02. Quantum Projection in an Ising Spin Liquid. https://doi.org/10.1103/physrevlett.99.057203

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