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Henrik Moodysson Rønnow

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Related publications (235)

Filming the formation and fluctuation of skyrmion domains by cryo-Lorentz transmission electron microscopy

Marco Cantoni, Arnaud Magrez, Thierry Giamarchi, Henrik Moodysson Rønnow, Fabrizio Carbone, Giulia Fulvia Mancini, Jonathan White, Edoardo Baldini, Ping Huang, Yoshie Murooka, Rajeswari Jayaraman, Tatiana Latychevskaia

Magnetic skyrmions are promising candidates as information carriers in logic or storage devices thanks to their robustness, guaranteed by the topological protection, and their nanometric size. Currently, little is known about the influence of parameters su ...

National Academy of Sciences2015

An ultra-low temperature scanning Hall probe microscope for magnetic imaging below 40 mK

Julian Piatek, Henrik Moodysson Rønnow

We describe the design of a low temperature scanning Hall probe microscope (SHPM) for a dilution refrigerator system. A detachable SHPM head with 25.4 mm OD and 200 mm length is integrated at the end of the mixing chamber base plate of the dilution refrige ...

American Institute of Physics2014

Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates

Helmuth Berger, Marco Grioni, Bastien Dalla Piazza, Henrik Moodysson Rønnow, Marco Guarise, Thorsten Schmitt

The high-T-c cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin wavesmagnons- of the antiferromagnetic insulating parent compounds, suggesting that ma ...

Nature Publishing Group2014

Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study

Henrik Moodysson Rønnow

The nature of the electronic ground state of Ba2IrO4 has been addressed using soft x-ray absorption and inelastic scattering techniques in the vicinity of the oxygen K edge. From the polarization and angular dependence of x-ray absorption spectroscopy (XAS ...

Amer Physical Soc2014

Exploration of the helimagnetic and skyrmion lattice phase diagram in Cu2OSeO3 using magnetoelectric susceptibility

Helmuth Berger, Arnaud Magrez, Krunoslav Prsa, Henrik Moodysson Rønnow, Ivica Zivkovic, Arash Alahgholipour Omrani, Jonathan White

Using superconducting quantum interference device magnetometry techniques, we have studied the change in magnetization versus applied ac electric field, i.e. the magnetoelectric (ME) susceptibility dM/dE, in the chiral-lattice ME insulator Cu2OSeO3. Measur ...

Amer Physical Soc2014

Prismatic analyser concept for neutron spectrometers

Henrik Moodysson Rønnow, Martin Mansson, Paul Gregory Freeman

Developments in modern neutron spectroscopy have led to typical sample sizes decreasing from few cm to several mm in diameter samples. We demonstrate how small samples together with the right choice of analyser and detector components makes distance collim ...

American Institute of Physics2014

Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4

Bastien Dalla Piazza, Julian Piatek, Stephen Paul Neithardt, Henrik Moodysson Rønnow, Ivan Kovacevic, Peter Babkevich

We present a study of the model spin-glass LiHo0.5Er0.5F4 using simultaneous ac susceptibility, magnetization, and magnetocaloric effect measurements along with small angle neutron scattering ( SANS) at sub-Kelvin temperatures. All measured bulk quantities ...

American Physical Society2014

Electric-Field-Induced Skyrmion Distortion and Giant Lattice Rotation in the Magnetoelectric Insulator Cu2OSeO3

Helmuth Berger, Arnaud Magrez, Krunoslav Prsa, Henrik Moodysson Rønnow, Ivica Zivkovic, Arash Alahgholipour Omrani, Jonathan White, Ping Huang

Uniquely in Cu2OSeO3, the Skyrmions, which are topologically protected magnetic spin vortexlike objects, display a magnetoelectric coupling and can be manipulated by externally applied electric (E) fields. Here, we explore the E-field coupling to the magne ...

American Physical Society2014

Temperature dependence of the pressure induced monoclinic distortion in the spin S=1/2 Shastry-Sutherland compound SrCu2(BO3)(2)

Mohamed Zayed, Henrik Moodysson Rønnow, Kazimierz Conder

We investigate the monoclinic distortion that occurs at 4.7 GPa at room temperature in the frustrated Shastry-Sutherland model quantum magnet SrCu2(BO3)(2) as a function of pressure and temperature by means of powder and single crystal angle dispersive syn ...

Elsevier2014

Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4

Sandrine Gerber, Bastien Dalla Piazza, Bruce Normand, Henrik Moodysson Rønnow, Kazimierz Conder, Vera Irina Schnells

We study the zero-point and thermal ionic motion in La2CuO4 by means of high-resolution neutron-diffraction experiments. Our results demonstrate anisotropic motion of O and, to a lesser extent, Cu ions, both consistent with the structure of coupled CuO6 oc ...

2014

Correlated Decay of Triplet Excitations in the Shastry-Sutherland Compound SrCu2(BO3)(2)

Mohamed Zayed, Henrik Moodysson Rønnow, Joël Mesot, Kazimierz Conder

The temperature dependence of the gapped triplet excitations (triplons) in the 2D Shastry-Sutherland quantum magnet SrCu2(BO3)(2) is studied by means of inelastic neutron scattering. The excitation amplitude rapidly decreases as a function of temperature, ...

American Physical Society2014

Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain

Martin Mourigal, Henrik Moodysson Rønnow, Mechthild Enderle, Jean-Sebastien Caux

One of the simplest quantum many-body systems is the spin-1/2 Heisenberg antiferromagnetic chain, a linear array of interacting magnetic moments. Its exact ground state is a macroscopic singlet entangling all spins in the chain. Its elementary excitations, ...

Nature Publishing Group2013

Low-energy spin dynamics of the s=1/2 kagome system herbertsmithite

Henrik Moodysson Rønnow, Goran Nilsen

The low-energy (epsilon = (h) over bar < 1 meV), low-temperature (T = 0.05 K) spin dynamics of the s = 1/2 kagome candidate herbertsmithite are probed in the presence of magnetic fields up to 2.5 T. The zero-field spectra reveal a very weak continuum of sc ...

Institute of Physics2013

Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba3YIr2O9

Henrik Moodysson Rønnow, Arash Alahgholipour Omrani

We report the structural transformation of hexagonal Ba3YIr2O9 to a cubic double perovskite form (stable in ambient conditions) under an applied pressure of 8 GPa at 1273 K. While the ambient pressure synthesized sample undergoes long-range magnetic orderi ...

Amer Physical Soc2013

Low-temperature spin dynamics of a valence bond glass in Ba2YMoO6

Julian Piatek, Henrik Moodysson Rønnow

We carried out ac magnetic susceptibility measurements and muon spin relaxation spectroscopy on the cubic double perovskite Ba2YMoO6, down to 50 mK. Below similar to 1 K the muon relaxation is typical of a magnetic insulator with a spin-liquid type ground ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2013

Electronic structure of KTi(SO4)(2)center dot H2O: An S=1/2 frustrated chain antiferromagnet

Julian Piatek, Henrik Moodysson Rønnow, Goran Nilsen

The compound KTi(SO4)(2)center dot H2O was recently reported as a quasi-one-dimensional spin-1/2 compound with competing antiferromagnetic nearest-neighbor exchange J(1) and next-nearest-neighbor exchange J(2) along the chain with a frustration ratio alpha ...

American Physical Society2013

Field-Induced Quantum Soliton Lattice in a Frustrated Two-Leg Spin-1/2 Ladder

Henrik Moodysson Rønnow, Joël Mesot, Shuang Wang, Kazimierz Conder, Siyuan Wang, Christian Rüegg

Based on high-field 31P nuclear magnetic resonance experiments and accompanying numerical calculations, it is argued that in the frustrated S=1/2 ladder compound BiCu2PO6 a field-induced soliton lattice develops above a critical field of μ0Hc1=20.96(7) T. ...

American Physical Society2013

Locking of iridium magnetic moments to the correlated rotation of oxygen octahedra in Sr2IrO4 revealed by x-ray resonant scattering

Henrik Moodysson Rønnow

Sr2IrO4 is a prototype of the class of Mott insulators in the strong spin-orbit interaction (SOI) limit described by a J(eff) = 1/2 ground state. In Sr2IrO4, the strong SOI is predicted to manifest itself in the locking of the canting of the magnetic momen ...

Institute of Physics2013

Temperature-dependent electron-phonon coupling in La_{2−x}Sr_{x}CuO_{4} probed by femtosecond x-ray diffraction

Majed Chergui, Paul Beaud, Mathieu Julien Gino Cottet, Krunoslav Prsa, Henrik Moodysson Rønnow, Fabrizio Carbone, Kazimierz Conder, Giulia Fulvia Mancini

The strength of the electron-phonon coupling parameter and its evolution throughout a solid's phase diagram often determines phenomena such as superconductivity, charge- and spin-density waves. Its experimental determination relies on the ability to distin ...

Amer Physical Soc2013

Determining the Short-Range Spin Correlations in the Spin-Chain Li2CuO2 and CuGeO3 Compounds Using Resonant Inelastic X-Ray Scattering

Henrik Moodysson Rønnow, Thorsten Schmitt, Vladimir N. Strocov

We report a high-resolution resonant inelastic soft x-ray scattering study of the quantum magnetic spin-chain materials Li2CuO2 and CuGeO3. By tuning the incoming photon energy to the oxygen K edge, a strong excitation around 3.5 eV energy loss is clearly ...

American Physical Society2013

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