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Henrik Moodysson Rønnow

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Related publications (235)

Quantum dynamics and entanglement of spins on a square lattice

Henrik Moodysson Rønnow, Mechthild Enderle

Bulk magnetism in solids is fundamentally quantum mechanical in nature. Yet in many situations, including our everyday encounters with magnetic materials, quantum effects are masked, and it often suffices to think of magnetism in terms of the interaction b ...

National Academy of Sciences2007

Nature of the magnetic order in the charge-ordered cuprate La1.48Nd0.4Sr0.12CuO4

Henrik Moodysson Rønnow, Joël Mesot, Mechthild Enderle

Using polarized neutron scattering we establish that the magnetic order in La1.48Nd0.4Sr0.12CuO4 is either (i) one dimensionally modulated and collinear, consistent with the stripe model or (ii) two dimensionally modulated with a novel noncollinear structu ...

AMERICAN PHYSICAL SOC2007

Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped La1.895Sr0.105CuO4 superconductor

Henrik Moodysson Rønnow, Joël Mesot, Mechthild Enderle, Johan Juul Chang

High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La1.895Sr0.105CuO4 (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q(IC)=( ...

AMERICAN PHYSICAL SOC2007

Two energy scales in the spin excitations of the high-temperature superconductor La2-xSrxCuO4

Henrik Moodysson Rønnow

The excitations responsible for producing high-temperature superconductivity in the copper oxides have yet to be identified. Two promising candidates are collective spin excitations and phonons(1). A recent argument against spin excitations is based on the ...

Nature Publishing Group2007

Magnetic excitations near the quantum phase transition in the Ising ferromagnet LiHoF4

Conradin Kraemer, Henrik Moodysson Rønnow

Effective-medium theory and inelastic neutron scattering are used to study the magnetic excitations in the Ising ferromagnet LiHoF4 near its magnetic-field-induced quantum phase transition (QPT). As expected, the dominant mode softens at the QPT, but reach ...

AMERICAN PHYSICAL SOC2007

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

Inelastic neutron scattering experiments with the monochromatic imaging mode of the RITA-II spectrometer

Henrik Moodysson Rønnow, Tom Larsen

Recently a monochromatic multiple data taking mode has been demonstrated for diffraction experiments using a RITA type cold neutron spectrometer with a multi-bladed analyser and a position-sensitive detector. Here, we show how this mode can be used in comb ...

2006

Incommensurate magnetic ordering in Cu2Te2O5X2 (X=Cl,Br) studied by single crystal neutron diffraction

Helmuth Berger, Henrik Moodysson Rønnow, Joël Mesot

Polarized and unpolarized neutron-diffraction studies have been carried out on single crystals of the coupled spin tetrahedra systems Cu2Te2O5X2 (X=Cl, Br). A model of the magnetic structure associated with the propagation vectors k(') (Cl) approximate to ...

2006

Polarons and confinement of electronic motion to two dimensions in a layered manganite

Henrik Moodysson Rønnow

A remarkable feature of layered transition-metal oxides-most famously, the high-temperature superconductors-is that they can display hugely anisotropic electrical and optical properties (for example, seeming to be insulating perpendicular to the layers and ...

2006

Static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3

Henrik Moodysson Rønnow

A comprehensive study of the static and dynamic critical properties of the quasi-two-dimensional antiferromagnet MnPS3 is presented. The relatively large spin S=5/2 of the Mn ions ensure predominantly classical behavior, and the compound is believed to be ...

2006

Quantum helimagnetism of the frustrated spin-(1)/(2) chain LiCuVO4

Henrik Moodysson Rønnow, Mechthild Enderle

Inelastic neutron scattering, susceptibility, and high-field magnetization identify LiCuVO4 as a nearest-neighbour ferromagnetic, next-nearest-neighbour frustrated, quasi-one-dimensional helimagnet, which is largely influenced by quantum fluctuations. Comp ...

IOP Publishing - EPL Association2005

Three-dimensionality of field-induced magnetism in a high-temperature superconductor

Henrik Moodysson Rønnow

Many physical properties of high-temperature superconductors are two-dimensional phenomena derived from their square-planar CuO2 building blocks. This is especially true of the magnetism from the copper ions. As mobile charge carriers enter the CuO2 layers ...

2005

Incommensurate magnetism in the coupled spin tetrahedra system Cu2Te2O5Cl2

Helmuth Berger, Henrik Moodysson Rønnow, Joël Mesot

Neutron scattering studies on powder and single crystals have provided new evidence for unconventional magnetism in Cu2Te2O5Cl2. The compound is built from tetrahedral clusters of S=1/2 Cu2+ spins located on a tetragonal lattice. Magnetic ordering, emergin ...

2005

Quantum phase transition of a magnet in a spin bath

Henrik Moodysson Rønnow

The excitation spectrum of a model magnetic system, LiHoF4, was studied with the use of neutron spectroscopy as the system was tuned to its quantum critical point by an applied magnetic field. The electronic mode softening expected for a quantum phase tran ...

American Association for the Advancement of Science2005

Charge ordering, stripes and phase separation in manganese perovskite oxides: An STM/STS study

Henrik Moodysson Rønnow

A microscopic characterisation of the phase transitions associated with colossal magnetoresistance (CMR) in manganese perovskite oxides is a very important ingredient in the quest of understanding its underlying mechanism. Scanning tunneling microscopy (ST ...

2005

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