Triangular lattice magnet GdGa$_2$ with short-period spin cycloids and possible skyrmion phases
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917966850818048 |
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| author | Baral, Priya R. Khanh, Nguyen Duy Gen, Masaki Sagayama, Hajime Nakao, Hironori Arima, Taka-hisa Ōnuki, Yoshichika Tokura, Yoshinori Hirschberger, Max |
| author_facet | Baral, Priya R. Khanh, Nguyen Duy Gen, Masaki Sagayama, Hajime Nakao, Hironori Arima, Taka-hisa Ōnuki, Yoshichika Tokura, Yoshinori Hirschberger, Max |
| contents | The two-dimensional triangular lattice (TAL) is a model system of magnetic frustration and competing interactions, where skyrmion spin vortices can be induced by a vertical magnetic field $B$. We target the binary compound GdGa$_2$ with an undistorted TAL of Gd$^{3+}$ Heisenberg moments. At higher temperature ($T > 5$ K, $B = 0$, phase II), we reveal the cycloidal spin textures in GdGa$_2$ via resonant elastic X-ray scattering (REXS). Further, a transition with strong magneto-elastic response occurs when cooling into the zero-field ground state ($T < 5$ K, phase I). We also report the thermodynamic phase boundaries of $B$-induced magnetic A-phases, which are suppressed by an in-plane magnetic field and which have enhanced resistivity due to the partial opening of a charge gap. In analogy to Gd$_2$PdSi$_3$ and GdRu$_2$Si$_2$, these phases may represent a superposition of various cycloids, possibly a Néel skyrmion lattice. Our work lays the basis for further studies of the magnetic phase diagram of GdGa$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18457 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Triangular lattice magnet GdGa$_2$ with short-period spin cycloids and possible skyrmion phases Baral, Priya R. Khanh, Nguyen Duy Gen, Masaki Sagayama, Hajime Nakao, Hironori Arima, Taka-hisa Ōnuki, Yoshichika Tokura, Yoshinori Hirschberger, Max Strongly Correlated Electrons The two-dimensional triangular lattice (TAL) is a model system of magnetic frustration and competing interactions, where skyrmion spin vortices can be induced by a vertical magnetic field $B$. We target the binary compound GdGa$_2$ with an undistorted TAL of Gd$^{3+}$ Heisenberg moments. At higher temperature ($T > 5$ K, $B = 0$, phase II), we reveal the cycloidal spin textures in GdGa$_2$ via resonant elastic X-ray scattering (REXS). Further, a transition with strong magneto-elastic response occurs when cooling into the zero-field ground state ($T < 5$ K, phase I). We also report the thermodynamic phase boundaries of $B$-induced magnetic A-phases, which are suppressed by an in-plane magnetic field and which have enhanced resistivity due to the partial opening of a charge gap. In analogy to Gd$_2$PdSi$_3$ and GdRu$_2$Si$_2$, these phases may represent a superposition of various cycloids, possibly a Néel skyrmion lattice. Our work lays the basis for further studies of the magnetic phase diagram of GdGa$_2$. |
| title | Triangular lattice magnet GdGa$_2$ with short-period spin cycloids and possible skyrmion phases |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.18457 |