Thielemann, B and Ruegg, C and Ronnow, HM and Lauchli, AM and Caux, JS and Normand, B and Biner, D and Kramer, KW and Gudel, HU and Stahn, J and Habicht, K and Kiefer, K and Boehm, M and McMorrow, DF and Mesot, J (2009) Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder. PHYS REV LETT , 102 (10) , Article 107204. 10.1103/PhysRevLett.102.107204.
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We measure by inelastic neutron scattering the spin excitation spectra as a function of applied magnetic field in the quantum spin-ladder material (C5H12N)(2)CuBr4. 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.
|Title:||Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder|
|Open access status:||An open access publication. A version is also available from UCL Discovery.|
|Additional information:||© 2009 The American Physical Society|
|Keywords:||MAGNETIC-FIELD, ANTIFERROMAGNET, CRITICALITY, DYNAMICS, CHAINS|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology|
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