Effect of uniaxial stress on helimagnetic phases in the square-lattice itinerant magnet EuAl$_{4}$
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908872818556928 |
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| author | Gen, Masaki Nomoto, Takuya Saito, Hiraku Nakajima, Taro Tokunaga, Yusuke Takagi, Rina Seki, Shinichiro Arima, Taka-hisa |
| author_facet | Gen, Masaki Nomoto, Takuya Saito, Hiraku Nakajima, Taro Tokunaga, Yusuke Takagi, Rina Seki, Shinichiro Arima, Taka-hisa |
| contents | We investigate uniaxial-stress effects on the magnetic phase diagram of the square-lattice itinerant magnet EuAl$_{4}$, where strong coupling among spin, lattice, and charge produces a variety of helimagnetic phases, including rhombic and square skyrmion lattices. Combining resistivity and magnetization measurements with neutron scattering, we find that compressive stresses of only several tens of megapascal along [010] enhance antiferromagnetic character and shorten the magnetic modulation period in the lowest-temperature single-Q spiral state, thereby driving the critical temperatures and fields of multiple phases to higher values. First-principles calculations show that increasing orthorhombic lattice distortion deforms the Fermi surface relevant to the magnetism, providing compelling evidence that Fermi-surface nesting plays a crucial role in stabilizing the helical magnetic modulations in EuAl$_{4}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_07079 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Effect of uniaxial stress on helimagnetic phases in the square-lattice itinerant magnet EuAl$_{4}$ Gen, Masaki Nomoto, Takuya Saito, Hiraku Nakajima, Taro Tokunaga, Yusuke Takagi, Rina Seki, Shinichiro Arima, Taka-hisa Strongly Correlated Electrons Materials Science We investigate uniaxial-stress effects on the magnetic phase diagram of the square-lattice itinerant magnet EuAl$_{4}$, where strong coupling among spin, lattice, and charge produces a variety of helimagnetic phases, including rhombic and square skyrmion lattices. Combining resistivity and magnetization measurements with neutron scattering, we find that compressive stresses of only several tens of megapascal along [010] enhance antiferromagnetic character and shorten the magnetic modulation period in the lowest-temperature single-Q spiral state, thereby driving the critical temperatures and fields of multiple phases to higher values. First-principles calculations show that increasing orthorhombic lattice distortion deforms the Fermi surface relevant to the magnetism, providing compelling evidence that Fermi-surface nesting plays a crucial role in stabilizing the helical magnetic modulations in EuAl$_{4}$. |
| title | Effect of uniaxial stress on helimagnetic phases in the square-lattice itinerant magnet EuAl$_{4}$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2511.07079 |