2008/12/19 by B. Thielemann, Ch. Rüegg, Christian Rüegg +21 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.102.107204
published as Phys. Rev. Lett. 102, 107204 (2009) · 4 pages, 4 figures
arxiv created 2008/12/19 · openalex publication_date 2009/03/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C5H12N)2CuBr4. Discrete magnon modes at low fields in the quantum disordered phase and at high fields in the saturated phase contrast sharply with a spinon continuum at intermediate fields characteristic of the Luttinger-liquid phase. By tuning the magnetic field, we drive the fractionalization of magnons into spinons and, in this deconfined regime, observe both commensurate and incommensurate continua.