Quantum Projection in an Ising Spin Liquid

Details Quantum Projection in an Ising Spin Liquid Quantum Projection in an Ising Spin Liquid

2007-06-29

arxiv.org/abs/0706.4480v2

Phys. Rev. Lett 99 057203 (2007)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.057203

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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