Long-period helical structures and twist-grain boundary phases induced by chemical substitution in the Mn$_{1−x}$ (Co, Rh)$_x$ Ge chiral magnet
In: ISSN: 1098-0121 ; EISSN: 1550-235X, 2017
academicJournal
Zugriff:
International audience ; We study the evolution of helical magnetism in MnGe chiral magnet upon partial substitution of Mn for 3$d$-Co and 4$d$-Rh ions. At high doping levels, we observe spin helices with very long periods—more than ten times larger than in the pure compound—and sizable ordered moments. This behavior calls for a change in the energy balance of interactions leading to the stabilization of the observed magnetic structures. Strikingly, neutron scattering unambiguously shows a double periodicity in the observed spectra at x=0.5 and >0.2 for Co- and Rh-doping, respectively. In analogy with observations made in smectic liquid crystals, we suggest that it may reveal the presence of magnetic “twist grain boundary” phases, involving a dense short-range correlated network of magnetic screw dislocations. The dislocation cores are here tentatively described as smooth textures, made of nonradial double-core skyrmions.
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Long-period helical structures and twist-grain boundary phases induced by chemical substitution in the Mn$_{1−x}$ (Co, Rh)$_x$ Ge chiral magnet
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| Autor/in / Beteiligte Person: | Martin, N. ; Deutsch, Maxime ; Chaboussant, G. ; Damay, F. ; Bonville, P. ; Fomicheva, L. ; Tsvyashchenko, A. ; Rössler, U. ; Mirebeau, I. ; Groupe Diffraction Poudres (GDP) ; Laboratoire Léon Brillouin (LLB - UMR 12) ; Institut Rayonnement Matière de Saclay (DRF) (IRAMIS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ; Cristallographie, Résonance Magnétique et Modélisations (CRM2) ; Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) ; Groupe Interfaces et matériaux (GIM) ; Laboratoire Nano-Magnétisme et Oxydes (LNO) ; Service de physique de l'état condensé (SPEC - UMR3680) ; Vereshchagin Institute for High Pressure Physics ; Russian Academy of Sciences Moscow (RAS) ; D.V. Skobeltsyn Institute of Nuclear Physics (SINP) ; Lomonosov Moscow State University (MSU) ; Leibniz Institute for Solid State and Materials Research (IFW Dresden) ; Association, Leibniz |
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| Zeitschrift: | ISSN: 1098-0121 ; EISSN: 1550-235X, 2017 |
| Veröffentlichung: | HAL CCSD ; American Physical Society, 2017 |
| Medientyp: | academicJournal |
| DOI: | 10.1103/PhysRevB.96.020413 |
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