The two-dimensional spin-gap system SrCu2(BO3)(2) shows unique physical properties due to the low-dimensionality character and the strong quantum fluctuations. Experimentally, 1/8, 1/4, and 1/3 plateaus have been observed in the magnetization curve under magnetic fields up to 70 T, and the 1/2 plateau is expected to be stabilized at higher magnetic fields. We argue that spin-lattice effects are necessary to describe the spin density profile at the plateaus, and we propose a simple microscopic model of spins interacting adiabatically with the lattice to reproduce the main features of the recent experimental results by nuclear magnetic resonance.
Theory of spin-density profile and lattice distortion in the magnetization plateaus of SrCu_2(BO_3)_2
BECCA F;
2003-01-01
Abstract
The two-dimensional spin-gap system SrCu2(BO3)(2) shows unique physical properties due to the low-dimensionality character and the strong quantum fluctuations. Experimentally, 1/8, 1/4, and 1/3 plateaus have been observed in the magnetization curve under magnetic fields up to 70 T, and the 1/2 plateau is expected to be stabilized at higher magnetic fields. We argue that spin-lattice effects are necessary to describe the spin density profile at the plateaus, and we propose a simple microscopic model of spins interacting adiabatically with the lattice to reproduce the main features of the recent experimental results by nuclear magnetic resonance.Pubblicazioni consigliate
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