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Journal articles
Partial ordering and phase elasticity in the MnGe short-period helimagnet
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.
Cited literature [61 references]
https://hal-cea.archives-ouvertes.fr/cea-02074769
Contributor : Nicolas Martin <>
Submitted on : Wednesday, March 20, 2019 - 8:38:03 PM
Last modification on : Tuesday, July 14, 2020 - 11:04:08 AM
Document(s) archivé(s) le : Friday, June 21, 2019 - 10:36:20 PM
Contributor : Nicolas Martin <>
Submitted on : Wednesday, March 20, 2019 - 8:38:03 PM
Last modification on : Tuesday, July 14, 2020 - 11:04:08 AM
Document(s) archivé(s) le : Friday, June 21, 2019 - 10:36:20 PM
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2019_PRB-RC_MnGe MIEZE.pdf
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