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.
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Contributor : Edmond Orignac <>
Submitted on : Monday, February 2, 2009 - 3:51:12 PM
Last modification on : Wednesday, March 27, 2019 - 4:02:05 PM

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Benedikt Thielemann, Christian Rüegg, K. Kiefer, H. M. Rønnow, Bruce Normand, et al.. Field-controlled magnetic order in the quantum spin-ladder system (Hpip)2CuBr4. Physical Review B : Condensed matter and materials physics, American Physical Society, 2009, 79 (2), pp.020408(R). ⟨10.1103/PhysRevB.79.020408⟩. ⟨ensl-00358028⟩



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