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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| Accès en ligne: | https://arxiv.org/abs/2411.09541 |
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| _version_ | 1866909552241278976 |
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| author | Reinold, Anneke Berger, Lucas Raczkowski, Marcin Zhao, Zhiying Kohama, Yoshimitsu Gen, Masaki Gorbunov, Denis I. Skourski, Yurii Zherlitsyn, Sergei Assaad, Fakher F. Lorenz, Thomas Wang, Zhe |
| author_facet | Reinold, Anneke Berger, Lucas Raczkowski, Marcin Zhao, Zhiying Kohama, Yoshimitsu Gen, Masaki Gorbunov, Denis I. Skourski, Yurii Zherlitsyn, Sergei Assaad, Fakher F. Lorenz, Thomas Wang, Zhe |
| contents | We report on a comprehensive thermodynamic study of a quasi-two-dimensional (quasi-2D) quantum magnet Cu$_2$(OH)$_3$Br which in the 2D layer can be viewed as strongly coupled alternating antiferromagnetic and ferromagnetic chains. In an applied magnetic field transverse to the ordered spins below $T_N=9.3$ K, a field-induced phase transition from the 3D ordered to a disordered phase occurs at $B_c=16.3$ T for the lowest temperature, which is featured by an onset of a one-half plateau-like magnetization. By performing quantum Monte Carlo simulations of the relevant 2D model, we find that the plateau-like magnetization corresponds to a partial symmetry restoration and the full polarization in the ferromagnetic chains. Our numerical simulations also show that the magnetization saturation occurs with full symmetry restoration at a much higher field of $B_s \simeq 95$ T, corresponding to a 1D quantum phase transition in the antiferromagnetic chains. We argue that the experimentally observed field-induced phase transition at $B_c$ follows from the partial symmetry restoration and the concomitant dimensional reduction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_09541 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction Reinold, Anneke Berger, Lucas Raczkowski, Marcin Zhao, Zhiying Kohama, Yoshimitsu Gen, Masaki Gorbunov, Denis I. Skourski, Yurii Zherlitsyn, Sergei Assaad, Fakher F. Lorenz, Thomas Wang, Zhe Strongly Correlated Electrons Materials Science We report on a comprehensive thermodynamic study of a quasi-two-dimensional (quasi-2D) quantum magnet Cu$_2$(OH)$_3$Br which in the 2D layer can be viewed as strongly coupled alternating antiferromagnetic and ferromagnetic chains. In an applied magnetic field transverse to the ordered spins below $T_N=9.3$ K, a field-induced phase transition from the 3D ordered to a disordered phase occurs at $B_c=16.3$ T for the lowest temperature, which is featured by an onset of a one-half plateau-like magnetization. By performing quantum Monte Carlo simulations of the relevant 2D model, we find that the plateau-like magnetization corresponds to a partial symmetry restoration and the full polarization in the ferromagnetic chains. Our numerical simulations also show that the magnetization saturation occurs with full symmetry restoration at a much higher field of $B_s \simeq 95$ T, corresponding to a 1D quantum phase transition in the antiferromagnetic chains. We argue that the experimentally observed field-induced phase transition at $B_c$ follows from the partial symmetry restoration and the concomitant dimensional reduction. |
| title | Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2411.09541 |