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

Thielemann, B; Ruegg, C; Kiefer, K; Ronnow, HM; Normand, B; Bouillot, P; Kollath, C; ... Mesot, J; + view all (2009) Field-controlled magnetic order in the quantum spin-ladder system (Hpip)(2)CuBr4. PHYS REV B , 79 (2) , Article 020408. 10.1103/PhysRevB.79.020408.

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Abstract

Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in the two-leg spin-ladder material (Hpip)(2)CuBr4. 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.

Type: Article
Title: Field-controlled magnetic order in the quantum spin-ladder system (Hpip)(2)CuBr4
DOI: 10.1103/PhysRevB.79.020408
Keywords: antiferromagnetic materials, copper compounds, critical exponents, fluctuations, Luttinger liquid, magnetic moments, magnetic structure, magnetisation, magnetocaloric effects, Monte Carlo methods, Neel temperature, neutron diffraction, organic compounds, X-Y model, CRITICALITY, DYNAMICS, CHAINS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/150226
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