B. Roessli
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View article: Field-Induced Magnon Decay, Magnon Shadows, and Rotonlike Excitations in the Honeycomb Antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbBr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Field-Induced Magnon Decay, Magnon Shadows, and Rotonlike Excitations in the Honeycomb Antiferromagnet Open
Although the search for quantum many-body phenomena in magnetic materials has a strong focus on highly frustrated systems, even unfrustrated quantum magnets show a multitude of unconventional phenomena in their spin excitation spectra. YbB…
View article: Field-Induced Magnon Decay, Magnon Shadows, and Roton-like Excitations in the Honeycomb Antiferromagnet YbBr$_3$
Field-Induced Magnon Decay, Magnon Shadows, and Roton-like Excitations in the Honeycomb Antiferromagnet YbBr$_3$ Open
Although the search for quantum many-body phenomena in magnetic materials has a strong focus on highly frustrated systems, even unfrustrated quantum magnets show a multitude of unconventional phenomena in their spin excitation spectra. YbB…
View article: Ground state magnetic structure and magnetic field effects in the layered honeycomb antiferromagnet YbOCl
Ground state magnetic structure and magnetic field effects in the layered honeycomb antiferromagnet YbOCl Open
YbOCl is a representative member of the van der Waals layered honeycomb rare-earth chalcohalide RChX (R = rare earth; Ch = O, S, Se, and Te; and X = F, Cl, Br, and I) family reported recently. Its spin ground state remains to be explored e…
View article: Phonon dispersion of quantum paraelectric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> in electric fields
Phonon dispersion of quantum paraelectric in electric fields Open
Here we report on an elastic and inelastic neutron scattering study addressing the effect of electric fields on quantum paraelectric SrTiO3. Our elastic scattering results find small changes as a function of field in a superlattice reflect…
View article: Magnetic skin effect in Pb(Fe <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext> _{1/2}$</mml:mtext> </mml:mrow> </mml:math> Nb <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext> _{1/2}$</mml:mtext> </mml:mrow> </mml:math> )O<sub>3</sub>
Magnetic skin effect in Pb(Fe Nb )O<sub>3</sub> Open
Relaxor-ferroelectrics display exceptional dielectric properties resulting from the underlying random dipolar fields induced by strong chemical inhomogeneity. An unusual structural aspect of relaxors is a skin-effect where the near-surface…
View article: Phonon dispersion of quantum paraelectric SrTiO3 in electric fields
Phonon dispersion of quantum paraelectric SrTiO3 in electric fields Open
Here we report on an elastic and inelastic neutron scattering study addressing the effect of electric fields on quantum paraelectric SrTiO3. Our elastic scattering results find small changes as a function of field in a superlattice reflect…
View article: The polarisation fluctuation length scale shaping the superconducting dome of SrTiO$_3$
The polarisation fluctuation length scale shaping the superconducting dome of SrTiO$_3$ Open
Superconducting domes, ubiquitous across a variety of quantum materials, are often understood as a window favorite for pairing opened by the fluctuations of competing orders. Yet, a quantitative understanding of how such a window closes is…
View article: Spin-orbital correlations from complex orbital order in MgV$_{2}$O$_{4}$
Spin-orbital correlations from complex orbital order in MgV$_{2}$O$_{4}$ Open
MgV$_{2}$O$_{4}$ is a spinel based on magnetic V$^{3+}$ ions which host both spin ($S=1$) and orbital ($l_{eff}=1$) moments. Owing to the underlying pyrochlore coordination of the magnetic sites, the spins in MgV$_{2}$O$_{4}$ only antiferr…
View article: Neutron scattering from local magnetoelectric multipoles: A combined theoretical, computational, and experimental perspective
Neutron scattering from local magnetoelectric multipoles: A combined theoretical, computational, and experimental perspective Open
We address magnetic neutron scattering in the presence of local noncentrosymmetric asymmetries of the magnetization density. Such inversion-symmetry breaking, combined with the absence of time-reversal symmetry, can be described in terms o…
View article: Neutron scattering from local magnetoelectric multipoles: a combined theoretical, computational, and experimental perspective
Neutron scattering from local magnetoelectric multipoles: a combined theoretical, computational, and experimental perspective Open
We address magnetic neutron scattering in the presence of local non-centrosymmetric asymmetries of the magnetization density. Such inversion-symmetry breaking, combined with the absence of time-reversal symmetry, can be described in terms …
View article: Mesoscopic fluctuating domains in strontium titanate
Mesoscopic fluctuating domains in strontium titanate Open
Spatial correlations between atoms can generate a depletion in the energy dispersion of acoustic phonons. Two well-known examples are rotons in superfluid helium and the Kohn anomaly in metals. Here we report on the observation of a large …
View article: Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet
Spin Density Wave versus Fractional Magnetization Plateau in a Triangular Antiferromagnet Open
We report an excellent realization of the highly nonclassical incommensurate spin-density wave (SDW) state in the quantum frustrated antiferromagnetic insulator Cs_{2}CoBr_{4}. In contrast to the well-known Ising spin chain case, here the …
View article: Mesoscopic tunneling in strontium titanate
Mesoscopic tunneling in strontium titanate Open
Spatial correlation between atoms can generate a depletion in the energy dispersion of acoustic phonons. Two well known examples are rotons in superfluid helium and the Kohn anomaly in metals. Here we report on the observation of a large s…
View article: Observation of plaquette fuctuations in the spin-1/2 honeycomb lattice YbBr3
Observation of plaquette fuctuations in the spin-1/2 honeycomb lattice YbBr3 Open
Quantum spin liquid materials are widely studied to improve our understanding of quantum entangled spin correlations in the absence of magnetic long-range order at T = 0 K. However, it is a challenging task to unambiguously identify a quan…
View article: Observation of plaquette fluctuations in the spin-1/2 honeycomb lattice
Observation of plaquette fluctuations in the spin-1/2 honeycomb lattice Open
Quantum spin liquids are materials that feature quantum entangled spin correlations and avoid magnetic long-range order at T = 0 K. Particularly interesting are two-dimensional honeycomb spin lattices where a plethora of exotic quantum spi…
View article: On the Robustness of the MnSi Magnetic Structure Determined by Muon Spin Rotation
On the Robustness of the MnSi Magnetic Structure Determined by Muon Spin Rotation Open
Muon spin rotation ( μ SR) spectra recorded for manganese silicide MnSi and interpreted in terms of a quantitative analysis constrained by symmetry arguments were recently published. The magnetic structures of MnSi in zero-field at low tem…
View article: Magnetic quadrupolar order in the chiral square cupola compound BaTiOCu<sub>4</sub>(PO<sub>4</sub>)<sub>4</sub>
Magnetic quadrupolar order in the chiral square cupola compound BaTiOCu<sub>4</sub>(PO<sub>4</sub>)<sub>4</sub> Open
We report neutron diffraction studies of the magnetic structure in BaTiOCu4(PO4)4 , which is a newly discovered magneticinsulator crystallizing in a tetragonal chiral crystal structure with P4212 space group [1]. The crystal structure isch…
View article: Complementary Response of Static Spin-Stripe Order and Superconductivity to Nonmagnetic Impurities in Cuprates
Complementary Response of Static Spin-Stripe Order and Superconductivity to Nonmagnetic Impurities in Cuprates Open
We report muon-spin rotation and neutron-scattering experiments on nonmagnetic Zn impurity effects on the static spin-stripe order and superconductivity of the La214 cuprates. Remarkably, it was found that, for samples with hole doping x≈1…
View article: Unconventional magnetic order in the conical state of MnSi
Unconventional magnetic order in the conical state of MnSi Open
In the temperature-magnetic field phase diagram, the binary metallic compound MnSi exhibits three magnetic phases below Tc ~ 29 K. An unconventional helicoidal phase is observed in zero field. At moderate field intensity a conical phase se…
View article: Determination of the zero-field magnetic structure of the helimagnet MnSi at low temperature
Determination of the zero-field magnetic structure of the helimagnet MnSi at low temperature Open
Below a temperature of approximately 29 K the manganese magnetic moments of\nthe cubic binary compound MnSi order to a long-range incommensurate helical\nmagnetic structure. Here, we quantitatively analyze a high-statistic zero-field\nmuon…
View article: Influence of planar defects in the octahedral tilt structure on the thermal depolarization of 0.964Na$_{1/2}$Bi$_{1/2}$TiO$_3$-0.036BaTiO$_3$
Influence of planar defects in the octahedral tilt structure on the thermal depolarization of 0.964Na$_{1/2}$Bi$_{1/2}$TiO$_3$-0.036BaTiO$_3$ Open
We study the relation between the temperature-dependent density of the electric-field-sensitive planar defects in a lead-free relaxor ferroelectric and its ferroelectric properties. The results obtained by diffuse neutron scattering on a 0…