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Field-controlled magnetic order in the quantum spin-ladder system (Hpip)2CuBr4

Thielemann, B.
Kiefer, K.
Rønnow, H. M.
Normand, B.
Orignac, E.
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Published in Physical Review. B, Condensed Matter. 2009, vol. 79, no. 2
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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THIELEMANN, B. et al. Field-controlled magnetic order in the quantum spin-ladder system (Hpip)2CuBr4. In: Physical Review. B, Condensed Matter, 2009, vol. 79, n° 2. https://archive-ouverte.unige.ch/unige:36045

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Deposited on : 2014-04-28

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