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Open AccessNew insight into tuning magnetic phases of RMn6Sn6 kagome metals
Predicting magnetic ordering in kagome compounds offers the possibility of harnessing topological or flat-band physical properties through tuning of the magnetism. Here, we examine the magnetic interactions an...
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Open AccessChiral and flat-band magnetic quasiparticles in ferromagnetic and metallic kagome layers
Magnetic kagome metals are a promising platform to develop unique quantum transport and optical phenomena caused by the interplay between topological electronic bands, strong correlations, and magnetic order. ...
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Article
Open AccessOrbital character of the spin-reorientation transition in TbMn6Sn6
Ferromagnetic (FM) order in a two-dimensional kagome layer is predicted to generate a topological Chern insulator without an applied magnetic field. The Chern gap is largest when spin moments point perpendicul...
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Article
Two-dimensional overdamped fluctuations of the soft perovskite lattice in CsPbBr3
Lead halide perovskites exhibit structural instabilities and large atomic fluctuations thought to impact their optical and thermal properties, yet detailed structural and temporal correlations of their atomic ...
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Article
Open AccessStrong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs
We use neutron scattering to study Vanadium (hole)-doped LiFe1−xVxAs. In the undoped state, LiFeAs exhibits superconductivity at Tc = 18 K and transverse incommensurate spin excitations similar to electron overdo...
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Open AccessDiscovery of coexisting Dirac and triply degenerate magnons in a three-dimensional antiferromagnet
Topological magnons are emergent quantum spin excitations featured by magnon bands crossing linearly at the points dubbed nodes, analogous to fermions in topological electronic systems. Experimental realisatio...
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Article
Open AccessSupersonic propagation of lattice energy by phasons in fresnoite
Controlling the thermal energy of lattice vibrations separately from electrons is vital to many applications including electronic devices and thermoelectric energy conversion. To remove heat without shorting e...
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Article
Separating the configurational and vibrational entropy contributions in metallic glasses
Glassy materials exist in nature and play a critical role in technology, but key differences between the glass, liquid and crystalline phases are not well understood. Over several decades there has been contro...
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Article
Higgs mode and its decay in a two-dimensional antiferromagnet
An inelastic neutron scattering study of the two-dimensional antiferromagnet Ca2RuO4 reveals evidence for a condensed-matter analogue of the Higgs mode, and its subsequent decay into transverse Goldstone modes.
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Open AccessCommensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa2CuO4+δ
Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and the pseudogap phenomena exhibited by the cuprates. Although the antiferromagnetic response in the pseudogap stat...
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Open AccessMagnon spectrum of the helimagnetic insulator Cu2OSeO3
Complex low-temperature-ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 became the first insulating helima...
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Correction: Corrigendum: Direct observation of dynamic charge stripes in La2–xSrxNiO4
Nature Communications 5: Article number: 3467 (2014); Published: 17 March 2014; Updated: 3 July 2014. One of the affiliations for D. Lamago was inadvertently omitted during the preparation of this Article, and...
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Phonon localization drives polar nanoregions in a relaxor ferroelectric
Relaxor ferroelectrics exemplify a class of functional materials where interplay between disorder and phase instability results in inhomogeneous nanoregions. Although known for about 30 years, there is no defi...
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Direct observation of dynamic charge stripes in La2–xSrxNiO4
The insulator-to-metal transition continues to be a challenging subject, especially when electronic correlations are strong. In layered compounds, such as La2–xSrxNiO4 and La2–xBaxCuO4, the doped charge carriers ...
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Glass-like phonon scattering from a spontaneous nanostructure in AgSbTe2
Materials with very low thermal conductivity are of great interest for both thermoelectric and optical phase-change applications. Synthetic nanostructuring is most promising for suppressing thermal conductivit...
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Quantum oscillations of nitrogen atoms in uranium nitride
The vibrational excitations of crystalline solids corresponding to acoustic or optic one-phonon modes appear as sharp features in measurements such as neutron spectroscopy. In contrast, many-phonon excitations...
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Open AccessNeutron Scattering Studies of spin excitations in hole-doped Ba0.67K0.33Fe2As2 superconductor
We report inelastic neutron scattering experiments on single crystals of superconducting Ba0.67K0.33Fe2As2 (Tc = 38 K). In addition to confirming the resonance previously found in powder samples, we find that spi...
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Open AccessSymmetry-breaking dynamical pattern and localization observed in the equilibrium vibrational spectrum of NaI
Intrinsic localized modes (ILMs) – also known as discrete breathers – are localized excitations that form without structural defects in discrete nonlinear lattices. For crystals in thermal equilibrium ILMs wer...
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Article
Evolution of spin excitations into the superconducting state in FeTe1−xSex
A neutron scattering study shows that the spin excitations in both pnictide- and copper-oxide-based superconductors have the same four-fold symmetry. If these excitations do indeed mediate the superconductivit...
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Article
Optimizing Fermi-chopper spectrometers for the Spallation Neutron Source
The construction of the next-generation Spallation Neutron Source (SNS) at Oak Ridge National Laboratory offers an opportunity to optimize instrument performance in conjunction with moderator and target buildi...
