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

References in corpus (5)

• The ALPS project release 1.3: open source software for strongly correlated systems
• Bose-Einstein Condensation in Magnetic Insulators
• Generalized Directed Loop Method for Quantum Monte Carlo Simulations
• Controlling Luttinger liquid physics in spin ladders under a magnetic field
• Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material

Cited by in corpus (2)

• Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
• Neutron scattering evidence for isolated spin-1/2 ladders in (C${}_5$D${}_{12}$N)${}_2$CuBr${}_4$