Skyrmion phase and competing magnetic orders on a breathing kagomé lattice

Max Hirschberger (), Taro Nakajima, Shang Gao, Licong Peng, Akiko Kikkawa, Takashi Kurumaji, Markus Kriener, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Kazuki Ohishi, Kazuhisa Kakurai, Yasujiro Taguchi, Xiuzhen Yu, Taka-hisa Arima and Yoshinori Tokura
Additional contact information
Max Hirschberger: RIKEN Center for Emergent Matter Science (CEMS)
Taro Nakajima: RIKEN Center for Emergent Matter Science (CEMS)
Shang Gao: RIKEN Center for Emergent Matter Science (CEMS)
Licong Peng: RIKEN Center for Emergent Matter Science (CEMS)
Akiko Kikkawa: RIKEN Center for Emergent Matter Science (CEMS)
Takashi Kurumaji: RIKEN Center for Emergent Matter Science (CEMS)
Markus Kriener: RIKEN Center for Emergent Matter Science (CEMS)
Yuichi Yamasaki: National Institute for Materials Science (NIMS)
Hajime Sagayama: Institute of Materials Structure Science, High Energy Accelerator Research Organization
Hironori Nakao: Institute of Materials Structure Science, High Energy Accelerator Research Organization
Kazuki Ohishi: Comprehensive Research Organization for Science and Society (CROSS)
Kazuhisa Kakurai: RIKEN Center for Emergent Matter Science (CEMS)
Yasujiro Taguchi: RIKEN Center for Emergent Matter Science (CEMS)
Xiuzhen Yu: RIKEN Center for Emergent Matter Science (CEMS)
Taka-hisa Arima: RIKEN Center for Emergent Matter Science (CEMS)
Yoshinori Tokura: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Magnetic skyrmion textures are realized mainly in non-centrosymmetric, e.g. chiral or polar, magnets. Extending the field to centrosymmetric bulk materials is a rewarding challenge, where the released helicity/vorticity degree of freedom and higher skyrmion density result in intriguing new properties and enhanced functionality. We report here on the experimental observation of a skyrmion lattice (SkL) phase with large topological Hall effect and an incommensurate helical pitch as small as 2.8 nm in metallic Gd3Ru4Al12, which materializes a breathing kagomé lattice of Gadolinium moments. The magnetic structure of several ordered phases, including the SkL, is determined by resonant x-ray diffraction as well as small angle neutron scattering. The SkL and helical phases are also observed directly using Lorentz-transmission electron microscopy. Among several competing phases, the SkL is promoted over a low-temperature transverse conical state by thermal fluctuations in an intermediate range of magnetic fields.

Date: 2019
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DOI: 10.1038/s41467-019-13675-4

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