SKM 2021 – wissenschaftliches Programm

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SYMS: Symposium Novel phases and dynamical properties of magnetic skyrmions

SYMS 1: Novel phases and dynamical properties of magnetic skyrmions

SYMS 1.4: Hauptvortrag

Dienstag, 28. September 2021, 11:45–12:15, Audimax 2

Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co₇Zn₇Mn₆ — •Jonathan White¹, Victor Ukleev¹, Kosuke Karube², Peter Derlet¹, Chennan Wang¹, Hubertus Luetkens¹, Daisuke Morikawa², Akiko Kikkawa², Lucile Mangin-Thro³, Andrew Wildes³, Yuichi Yamasaki^4,5, Yuichi Yokoyama⁴, Le Yu^1,6, Cinthia Piamonteze¹, Nicolas Jaouen⁷, Yusuke Tokunaga⁸, Henrik Rønnow⁶, Taka-hisa Arima^2,8, Yoshinori Tokura^2,8, and Yasujiro Taguchi² — ¹Paul Scherrer Institut, Switzerland — ²RIKEN CEMS, Japan — ³Institut Laue-Langevin, France — ⁴NIMS, Japan — ⁵PRESTO, Japan — ⁶EPFL, Switzerland — ⁷Synchrotron Soleil, France — ⁸University of Tokyo, Japan

Magnetic skyrmion phases in noncentrosymmetric magnets are an established testbed for topological quantum matter research. In chiral cubic Co-Zn-Mn compounds, Bloch-type skyrmion phases are easily tuned according to composition, and display, amongst other phenomena, remarkable metastable skyrmion behaviour. Here we focus on Co₇Zn₇Mn₆, which we showed recently to host two thermodynamically distinct equilibrium skyrmion phases. In addition to a conventional A-phase stable near T_c, the second phase is instead stable at much lower temperature. From our most recent quantum beam experiments, we find the stability of the low temperature phase is uniquely derived from a novel cooperative interplay between chiral magnetism and magnetic frustration-induced spin fluctuations generated by a magnetic hyper-kagome motif embedded in the crystal structure.