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

N. Martin; I. Mirebeau; C. Franz; G. Chaboussant; L. Fomicheva; N. Fomicheva; A. Tsvyashchenko

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

N. Martin ^{1, *} I. Mirebeau ¹ C. Franz ² G. Chaboussant ³ L. Fomicheva ⁴ N. Fomicheva ⁴ A. Tsvyashchenko ⁴

* Corresponding author

1 LLB - UMR 12 - Laboratoire Léon Brillouin

2 TUM - Technische Universität München [München]

3 GIM - Groupe Interfaces et matériaux

LLB - UMR 12 - Laboratoire Léon Brillouin : DRF/IRAMIS/LLB, IRAMIS - Institut Rayonnement Matière de Saclay : DRF/IRAMIS/LLB

4 Vereshchagin Institute for High Pressure Physics

Abstract : We study the helimagnetic ground state of the MnGe cubic alloy using small-angle neutron scattering and a high-resolution method, the so-called MIEZE spectroscopy. Upon cooling below the Néel temperature $T_N$ = 170(5) K, we observe the proliferation of long-wavelength $gapless$ spin fluctuations, concomitant with a continuous evolution of the helical correlation length. These fluctuations disappear at $T_{com}$ = 32(5) K when the helical period becomes commensurate with the lattice. We propose to describe this intermediate phase as a soliton lattice, promoting nonlinear collective modes, or $phasons$, over a large temperature interval. We discuss the possible relevance of our results to the previously observed magnetotransport anomalies.

Document type :

Journal articles

Domain :

Physics [physics]

Physics [physics] / Condensed Matter [cond-mat]

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https://hal-cea.archives-ouvertes.fr/cea-02074769
Contributor : Nicolas Martin <>
Submitted on : Wednesday, March 20, 2019 - 8:38:03 PM
Last modification on : Saturday, March 23, 2019 - 1:15:52 AM
Long-term archiving on : Friday, June 21, 2019 - 10:36:20 PM

2019_PRB-RC_MnGe MIEZE.pdf

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

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