Room-temperature skyrmion phase in bulk Cu2OSeO3 under high pressures

Liangzi Deng, Hung Cheng Wu, Alexander P. Litvinchuk, Noah F.Q. Yuan, Jey Jau Lee, Rabin Dahal, Helmuth Berger, Hung Duen Yang, Ching Wu Chu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A skyrmion state in a noncentrosymmetric helimagnet displays topologically protected spin textures with profound technological implications for high-density information storage, ultrafast spintronics, and effective microwave devices. Usually, its equilibrium state in a bulk helimagnet occurs only over a very restricted magnetic field–temperature phase space and often in the low-temperature region near the magnetic transition temperature Tc. We have expanded and enhanced the skyrmion phase region from the small range of 55 to 58.5 K to 5 to 300 K in single-crystalline Cu2OSeO3 by pressures up to 42.1 GPa through a series of phase transitions from the cubic P213, through orthorhombic P212121 and monoclinic P21, and finally to the triclinic P1 phase, using our newly developed ultrasensitive high-pressure magnetization technique. The results are in agreement with our Ginzburg–Landau free energy analyses, showing that pressures tend to stabilize the skyrmion states and at higher temperatures. The observations also indicate that the skyrmion state can be achieved at higher temperatures in various crystal symmetries, suggesting the insensitivity of skyrmions to the underlying crystal lattices and thus the possible more ubiquitous presence of skyrmions in helimagnets.

Original languageEnglish
Pages (from-to)8783-8787
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number16
DOIs
Publication statusPublished - 2020 Apr 21

All Science Journal Classification (ASJC) codes

  • General

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