The interaction between superconductivity and magnetism creates numerous exotic physical phenomena, while the two phenomena rarely coexist in one material due to their antagonistic nature.
The recently discovered iron-based magnetic superconductor EuRbFe4As4 shows high-critical-temperature superconductivity and helimagnetic order at the ground state.
Shigeyuki Ishida, Senior Researcher, Hiraku Ogino, Senior Researcher, Akira Iyo, Chief Senior Researcher and Hiroshi Eisaki, Prime Senior Researcher of Superconducting Electronics Group, together with Comprehensive Research Organization for Science and Society (CROSS),
TU Wien, and IMRA JAPAN CO., LTD, discovered a phenomenon that the spin orientation is determined by the direction of the superconducting vortices in
. Moreover, it was demonstrated that the domain structure of the local spins can be manipulated by the distribution of superconducting vortices.
The capability of manipulating the spin texture by controlling the direction of superconducting vortices opens a path to novel devices such as superconducting memories using magnetic superconductors.
For the details, please refer to "Proceedings of the National Academy of Sciences of the United States of America"
A. Crystal structure of EuRbFe4As4. Blue arrows indicate the direction of the Eu2+ moments in the magnetically ordered state.
B. Temperature dependence of magnetization. Superconducting transition and magnetic ordering ocurr at 36 K and 15 K, respectively.