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  • Title: Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet.
    Author: Karube K, White JS, Morikawa D, Dewhurst CD, Cubitt R, Kikkawa A, Yu X, Tokunaga Y, Arima TH, Rønnow HM, Tokura Y, Taguchi Y.
    Journal: Sci Adv; 2018 Sep; 4(9):eaar7043. PubMed ID: 30225364.
    Abstract:
    Magnetic skyrmions are vortex-like topological spin textures often observed to form a triangular-lattice skyrmion crystal in structurally chiral magnets with the Dzyaloshinskii-Moriya interaction. Recently, β-Mn structure-type Co-Zn-Mn alloys were identified as a new class of chiral magnet to host such skyrmion crystal phases, while β-Mn itself is known as hosting an elemental geometrically frustrated spin liquid. We report the intermediate composition system Co7Zn7Mn6 to be a unique host of two disconnected, thermal-equilibrium topological skyrmion phases; one is a conventional skyrmion crystal phase stabilized by thermal fluctuations and restricted to exist just below the magnetic transition temperature Tc, and the other is a novel three-dimensionally disordered skyrmion phase that is stable well below Tc. The stability of this new disordered skyrmion phase is due to a cooperative interplay between the chiral magnetism with the Dzyaloshinskii-Moriya interaction and the frustrated magnetism inherent to β-Mn.
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