Igor Zaliznyak

The experimental observation of quantum Hall effect of lD3 chiral quasiparticles in trilayer graphene

Soon after the isolation of graphene, it was discovered that the charge carriers in monolayer and bilayer sheets exhibit exotic Berry phases of π and 2π respectively. Now, magnetotransport measurements suggest the sequence continues in trilayer graphene, with charge carriers that exhibit a Berry phase of 3π.

Independent freezing of charge and spin dynamics in La1.5Sr0.5CoO4

We present elastic and quasielastic neutron scattering measurements characterizing peculiar short-range charge-orbital and spin order in the layered perovskite material La1.5Sr0.5CoO4. We find that below T(c) approximately 750 K holes introduced by Sr doping lose mobility and enter a statically ordered charge glass phase with loosely correlated checkerboard arrangement of empty and occupied d(3z(2)-r(2)) orbitals ( Co3+ and Co2+). The dynamics of the resultant mixed spin system is governed by the anisotropic nature of the crystal-field Hamiltonian and the peculiar exchange pattern produced by the orbital order. It undergoes a spin freezing transition at a much lower temperature, T(s) less, similar30 K.

Effect of Covalent Bonding on Magnetism and the Missing Neutron Intensity in Copper Oxide Compounds

Covalent bonding and magnetism in cuprates Andrew C. Walters, Toby G. Perring, Jean-Sébastien Caux, Andrei T. Savici, Genda D. Gu, Chi-Cheng Lee, Wei Ku, and Igor A. Zaliznyak 1 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK Department of Physics, University College London, Gower Street, London WC1E 6BT 3 London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AJ, UK 4 Institute for Theoretical Physics, University of Amsterdam, 1018 XE Amsterdam, The NetherlandsA study of a one-dimensional system may have finally resolved the long-standing discrepancy between the expected and measured inelastic neutron scattering intensities in the high-temperature cuprate superconductors.

Spin-entropy-driven melting of the charge order in La 1.5 Sr 0.5 CoO 4

We studied the melting of the charge order in the half-doped tetragonal perovskite

Magnetic anisotropy and low-energy spin waves in the Dzyaloshinskii-Moriya spiral magnet Ba{sub 2}CuGe{sub 2}O{sub 7}

{\mathrm{La}}_{1.5}{\mathrm{Sr}}_{0.5}{\mathrm{CoO}}_{4}

Metal to Insulator Transition on the N = 0 Landau Level in Graphene

by elastic neutron scattering. We found that diffuse peaks, corresponding to the breathing-type modulation of oxygen positions in the

Continuum in the spin-excitation spectrum of a haldane chain observed by neutron scattering in CsNiCl3.

{\mathrm{CoO}}_{6}

Frustration-induced two-dimensional quantum disordered phase in piperazinium hexachlorodicuprate

octahedra, disappear above

Quasiparticle breakdown in a quantum spin liquid

{T}_{c}=825(27) \mathrm{K}.

Superconductivity, antiferromagnetism, and neutron scattering

This melting of the diffuse superstructure is reversible (no change in the correlation lengths upon annealing is observed) and accompanied by a large nonlinear thermal expansion along the tetragonal c axis, with a cusp at