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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2009

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

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Pierre Bouillot
  • Function : Author
Edmond Orignac
Thierry Giamarchi
  • Function : Author
J. Stahn
  • Function : Author
Beatrice Grenier

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.

Dates and versions

ensl-00358028 , version 1 (02-02-2009)

Identifiers

Cite

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 (1998-2015), 2009, 79 (2), pp.020408(R). ⟨10.1103/PhysRevB.79.020408⟩. ⟨ensl-00358028⟩
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