Helimagnon bands as universal excitations of chiral magnets

Janoschek, M.; Bernlochner, F. U.; Dunsiger, S. R.; Pfleiderer, C.; Böni, P.; Roessli, B.; Link, P.; Rosch, Achim

doi:10.1103/physrevb.81.214436

Cited by 71 publications

(78 citation statements)

References 46 publications

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“…Low-energy spin excitations in MnSi have been also studied in detail. In the zero-field helical phase, infinitely folded helimagnon bands were observed, and were attributed to its incommensurability 23 . In the induced-ferromagnetic phase, well-defined magnon excitations were observed at low energies E < 2.5 meV, whereas for E > 2.5 meV the magnon excitation becomes overdumped due to the particle-hole excitation continuum, called Storner continuum 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

et al. 2016

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Small angle neutron inelastic scattering measurement has been performed to study the magnon dispersion relation in the field-induced-ferromagnetic phase of the noncentrosymmetric binary compound MnSi. For the magnons propagating parallel or anti-parallel to the external magnetic field, we experimentally confirmed that the dispersion relation is asymmetrically shifted along the magnetic field direction. This magnon dispersion shift is attributed to the relativistic Dzyaloshinskii-Moriya interaction, which is finite in noncentrosymmetric magnets, such as MnSi. The shift direction is found to be switchable by reversing the external magnetic field direction.

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Section: Introductionmentioning

confidence: 99%

Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

et al. 2016

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“…Interestingly, a recent calculation by Belitz et al shows that for a helimagnet driven by the DMI, exceptionally soft Goldstone modes are expected that would lead to anomalous thermodynamic and transport properties even inside the ordered phase [175]. We have recently performed an inelastic neutron scattering study that clearly demonstrates that helimagnons indeed exist in the proposed form at ambient pressure [176].…”

Section: Mnsimentioning

confidence: 94%

“…14 [176]. A naive interpretation of the data suggests an extreme form of broadening caused by an exotic damping mechanism.…”

Section: Mnsimentioning

confidence: 99%

“…Currently, there is no theoretical account of how the observed forms of complex chiral magnetic order may induce the NFL resistivity observed in MnSi; further theoretical efforts along this line would be highly desirable. From the experimental point of view, the clear understanding of the Goldstone modes of the helimagnetic ground state at ambient pressure [176] may provide a new route towards the exploration of the unconventional behavior above P c . Here, the future challenge consists of tracking the helimagnons as a function of pressure in order to verify that their characteristics change distinctively around P c or if even entirely new excitations are observed.…”

Section: Mnsimentioning

confidence: 99%

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Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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“…More recently a SNP device has also been used to study chiral systems in both elastic 7 and inelastic scattering. 20 The application extends to broad fields including multiferroics, 21,22 heavy fermions, 23 and superconductors. 24 Currently most SNP measurements have focused on diffraction; however, the technique can also be used for 3D neutron depolarization 25 and inelastic scattering.…”

Section: Introductionmentioning

confidence: 99%

Compact spherical neutron polarimeter using high-Tc YBCO films

Wang

Parnell

Hamilton

et al. 2016

Review of Scientific Instruments

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We describe a simple, compact device for spherical neutron polarimetry measurements at small neutron scattering angles. The device consists of a sample chamber with very low (<0.01 G) magnetic field flanked by regions within which the neutron polarization can be manipulated in a controlled manner. This allows any selected initial and final polarization direction of the neutrons to be obtained. We have constructed a prototype device using high-Tc superconducting films and mu-metal to isolate regions with different magnetic fields and tested device performance in transmission geometry. Finite-element methods were used to simulate the device’s field profile and these have been verified by experiment using a small solenoid as a test sample. Measurements are reported using both monochromatic and polychromatic neutron sources. The results show that the device is capable of extracting sample information and distinguishing small angular variations of the sample magnetic field. As a more realistic test, we present results on the characterization of a 10 μm thick Permalloy film in zero magnetic field, as well as its response to an external magnetic field.

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Helimagnon bands as universal excitations of chiral magnets

Cited by 71 publications

References 46 publications

Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

Magnon dispersion shift in the induced ferromagnetic phase of noncentrosymmetric MnSi

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

Compact spherical neutron polarimeter using high-Tc YBCO films

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