C - Laboratory for Solid State Physics - ETH Zürich

Contents 7
9 Neutron scattering and magnetism 81
9.1 Phase transitions in magnetically ordered systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
9.1.1 Novel AF-cone phase of an exotic Dzyaloshinskii-Moriya helimagnet . . . . . . . . . . . . 83
9.1.2 Double spin flop transition in a quasi-1D antiferromagnet . . . . . . . . . . . . . . . . . . . 84
9.2 Excitations and scaling in quantum magnets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
9.2.1 Field dependence of the Luttinger parameter in a Heisenberg spin chain . . . . . . . . . . . 84
9.2.2 Finite-T effects in a quantum spin ladder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9.2.3 An almost-perfect strong-leg quantum spin ladder . . . . . . . . . . . . . . . . . . . . . . . 86
9.3 Static disorder in quantum magnets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
9.3.1 Quenched disorder in a quasi-2D quantum spin liquid . . . . . . . . . . . . . . . . . . . . . 87
9.3.2 Random field state in a disordered frustrated quantum spin ladder . . . . . . . . . . . . . . . 88
9.3.3 Effect of bond disorder on weakly-coupled spin-1/2 chains . . . . . . . . . . . . . . . . . . . 88
9.4 Ferroelectric materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
10 Publications 91
11 Presentations 105