Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4

Abstract

Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in the two-leg spin-ladder material (Hpip)2CuBr4. This "classical" phase, a consequence of weak interladder coupling, is nevertheless highly unconventional: its properties are influenced strongly by the spin Luttinger-liquid state of the ladder subunits. We determine directly the order parameter (transverse magnetization), the ordering temperature, the spin structure, and the critical exponents around the transition. We introduce a minimal, microscopic model for the interladder coupling and calculate the quantum fluctuation corrections to the mean-field interaction.

4 pages, 4 figures, some changes in presentation

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• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
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• Investigating field-induced magnetic order in Han Purple by neutron scattering up to 25.9 T
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