Christian Rüegg

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Publications associées (24)

Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder

Bruce Normand, Henrik Moodysson Rønnow, Joël Mesot, Jean-Sebastien Caux, Daniel Biner, Christian Rüegg

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 t ...

2009

Evidence for spinon localization in the heat transport of the spin-1/2 ladder compound (C5H12N)(2)CuBr4

Henrik Moodysson Rønnow, Christian Rüegg

We present experiments on the magnetic-field-dependent thermal transport in the spin-1/2 ladder system (C5H12N)(2)CuBr4. The thermal conductivity kappa(B) is only weakly affected by the field-induced transitions between the gapless Luttinger-liquid state r ...

2009

Inelastic x-ray scattering study of superconducting SmFeAsO1-xFy single crystals: Evidence for strong momentum-dependent doping-induced renormalizations of optical phonons

Henrik Moodysson Rønnow, Sergiy Katrych, Christian Rüegg

We report inelastic x-ray scattering experiments on the lattice dynamics in SmFeAsO and superconducting SmFeAsO0.60F0.35 single crystals. Particular attention was paid to the dispersions along the [100] direction of three optical modes close to 23 meV, pol ...

2009

Multiple magnon modes and consequences for the Bose-Einstein condensed phase in BaCuSi2O6

Bruce Normand, Henrik Moodysson Rønnow, Christian Rüegg

The compound BaCuSi2O6 is a quantum magnet with antiferromagnetic dimers of S=1/2 moments on a quasi-2D square lattice. We have investigated its spin dynamics by inelastic neutron scattering experiments on single crystals with an energy resolution consider ...

AMERICAN PHYSICAL SOC2007

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