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

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

2008-09-02

arxiv.org/abs/0809.0440v2

Phys. Rev. B, Rapid Comm., 79, 020408 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, some changes in presentation

Scientific paper

10.1103/PhysRevB.79.020408

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.

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