Partial ordering and phase elasticity in the MnGe short-period helimagnet

Martín, Nicolás Bas; Mirebeau, I.; Franz, Christian; Chaboussant, Grégory; Фомичева, Л.Н.; Tsvyashchenko, A. V.

doi:10.1103/physrevb.99.100402

Cited by 21 publications

(7 citation statements)

References 44 publications

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“…In particular, the magnetic excitations of HL states may show unique low-energy spectral features, reflecting the dynamics of topological point defects. This would be clarified by recent theories for threedimensional topological spin texture [37][38][39][40] or can be directly observed by inelastic neutron scattering techniques [41]. Our findings highlight the large fluctuations of spin hedgehogs as a source of nonreciprocal conduction, which may enable the magnetically-controllable rectification of electron flows.…”

supporting

confidence: 52%

Enhanced Electrical Magnetochiral Effect by Spin-hedgehog Lattice Structural Transition

Kitaori,

Kanazawa,

Ishizuka

et al. 2021

Preprint

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Nonreciprocal resistance, depending on both directions of current (j) and magnetic-field (H) or magnetization (M ), is generally expected to emerge in a chiral conductor, and be maximized for j H(M ). This phenomenon, electrical magnetochiral effect (eMChE), is empirically known to increase with H in a paramagnetic or fully ferromagnetic state on chiral lattice or to depend on fluctuation properties of a helimagnetic state. We report here the eMChE over a wide temperature range in the chiral-lattice magnet MnGe in which the spin hedgehog lattice (HL) forms with the triple spin-helix modulation vectors. The magnitude of nonreciprocal resistivity is sharply enhanced in the course of the field-induced structural transition of HL from cubic to rhombohedral form. This is attributed to the enhanced asymmetric electron scatterings by vector spin chirality in association with the large thermal fluctuations of spin hedgehogs.

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supporting

confidence: 52%

Enhanced Electrical Magnetochiral Effect by Spin-hedgehog Lattice Structural Transition

Kitaori,

Kanazawa,

Ishizuka

et al. 2021

Preprint

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“…As has been demonstrated a number of times [12,16,[35][36][37][38], this setup imparts the capability to measure with magnetic samples, magnetic fields in the sample environment, and samples with a high incoherent scattering cross section. These capabilities are acquired without the need for the instrumental complexities faced in ferromagnetic spin-echo [16,39].…”

Section: The Mieze Techniquementioning

confidence: 99%

MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA

2022

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The RESEDA (Resonant Spin-Echo for Diverse Applications) instrument has been optimized for neutron scattering measurements of quasi-elastic and inelastic processes over a wide parameter range. One spectrometer arm of RESEDA is configured for the MIEZE (Modulation of Intensity with Zero Effort) technique, where the measured signal is an oscillation in neutron intensity over time prepared by two precisely tuned radio-frequency (RF) flippers. With MIEZE, all spin-manipulations are performed before the beam reaches the sample, and thus the signal from sample scattering is not disrupted by any depolarizing conditions there (i.e. magnetic materials and fields). The MIEZE spectrometer is being further optimized for the requirements of small angle neutron scattering (MIASANS), a versatile combination of the spatial and dynamical resolving power of both techniques. We present the current status of (i) the newly installed superconducting solenoids as part of the RF flippers to significantly extend the dynamic range (ii) the development and installation of a new detector on a translation stage within a new larger SANS-type vacuum vessel for flexibility with angular coverage and resolution, and (iii) the efforts to reduce background.

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“…In the superconducting ferromagnet UGe 2 , a cross -over between dynamical properties characteristic of local -moment and itinerant -electron magnetism could be identified [17]. RESEDA was used in a study of the fluctuation -induced phase transitions in cubic chiral magnets, highlighting the complexities of the phase diagrams of these compounds, such as the weak crystallization of skyrmion textures [35,52,72,34,11]. A recent highlight concerned the study of emergent Landau levels in MnSi: The motion of a spin excitation across topologically nontrivial magnetic order leads to the emergence of Landau levels in the excitations spectrum for magnons in such systems.…”

Section: Introductionmentioning

confidence: 99%

Extending MIEZE spectroscopy towards thermal wavelengths

Jochum¹,

Keller²,

Pfleiderer³

2022

Preprint

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We propose a Modulation of intensity with zero effort (MIEZE) setup for high -resolution neutron spectroscopy at momentum transfers up to 3 Å−1 ,energy transfers up to 20 meV, and an energy resolution in the µeVrange using both thermal and cold neutrons. MIEZE has two prominent advantages compared to classical neutron spin -echo. The first one is the possibility to investigate spin -depolarizing samples or samples in strong magnetic fields without loss of signal amplitude and intensity. This allows for the study of spin fluctuations in ferromagnets, and facilitates the study of samples with strong spin -incoherent scattering. The second advantage is that multi -analyzer setups can be implemented with comparatively small effort. The use of thermal neutrons increases the range of validity of the spin -echo approximation towards shorter spin -echo times. In turn, the thermal MIEZE option for greater ranges (TIGER) closes the gap between classical neutron spin -echo spectroscopy and conventional highresolution neutron spectroscopy techniques such as triple -axis, time -offlight, and back -scattering. To illustrate the feasibility of TIGER we present the details of an implementation at the beamline RESEDA at FRM II by means of an additional velocity selector, polarizer and analyzer.

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Partial ordering and phase elasticity in the MnGe short-period helimagnet

Cited by 21 publications

References 44 publications

Enhanced Electrical Magnetochiral Effect by Spin-hedgehog Lattice Structural Transition

Enhanced Electrical Magnetochiral Effect by Spin-hedgehog Lattice Structural Transition

MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA

Extending MIEZE spectroscopy towards thermal wavelengths

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