Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu$_2$PO$_6$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916588512346112 |
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| author | Pilch, Patrick Amelin, Kirill Schmiedinghoff, Gary Reinold, Anneke Zhu, Changqing Povarov, Kirill Yu. Zvyagin, Sergei Engelkamp, Hans Lan, Yin-Ping Shu, Guo-Jiun Chou, Fang-Cheng Nagel, Urmas Rõõm, Toomas Uhrig, Götz S. Fauseweh, Benedikt Wang, Zhe |
| author_facet | Pilch, Patrick Amelin, Kirill Schmiedinghoff, Gary Reinold, Anneke Zhu, Changqing Povarov, Kirill Yu. Zvyagin, Sergei Engelkamp, Hans Lan, Yin-Ping Shu, Guo-Jiun Chou, Fang-Cheng Nagel, Urmas Rõõm, Toomas Uhrig, Götz S. Fauseweh, Benedikt Wang, Zhe |
| contents | We report on terahertz spectroscopic measurements of quantum spin dynamics on single crystals of a spin-1/2 frustrated spin-ladder antiferromagnet BiCu$_2$PO$_6$ as a function of temperature, polarization, and applied external magnetic fields. Spin triplon excitations are observed at zero field and split in applied magnetic fields. For magnetic fields applied along the crystallographic $a$ axis, a quantum phase transition at $B_{c1}=21.4 \mathrm{T}$ is featured by a low-energy excitation mode emerging above $B_{c1}$ which indicates a gap reopening. For fields along the $b$ axis and the $c$ axis, different field dependencies are observed for the spin triplon excitations, whereas no low-lying modes could be resolved at field-induced phase transitions. We perform a theoretical analysis of the magnetic field dependence of the spin triplon modes by using continuous unitary transformations to determine an effective low energy Hamiltonian. Through an exhaustive parameter search we find numerically optimized parameters to very well describe the experimentally observed modes, which corroborate the importance of significant magnetic anisotropy in the system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_20103 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu$_2$PO$_6$ Pilch, Patrick Amelin, Kirill Schmiedinghoff, Gary Reinold, Anneke Zhu, Changqing Povarov, Kirill Yu. Zvyagin, Sergei Engelkamp, Hans Lan, Yin-Ping Shu, Guo-Jiun Chou, Fang-Cheng Nagel, Urmas Rõõm, Toomas Uhrig, Götz S. Fauseweh, Benedikt Wang, Zhe Strongly Correlated Electrons We report on terahertz spectroscopic measurements of quantum spin dynamics on single crystals of a spin-1/2 frustrated spin-ladder antiferromagnet BiCu$_2$PO$_6$ as a function of temperature, polarization, and applied external magnetic fields. Spin triplon excitations are observed at zero field and split in applied magnetic fields. For magnetic fields applied along the crystallographic $a$ axis, a quantum phase transition at $B_{c1}=21.4 \mathrm{T}$ is featured by a low-energy excitation mode emerging above $B_{c1}$ which indicates a gap reopening. For fields along the $b$ axis and the $c$ axis, different field dependencies are observed for the spin triplon excitations, whereas no low-lying modes could be resolved at field-induced phase transitions. We perform a theoretical analysis of the magnetic field dependence of the spin triplon modes by using continuous unitary transformations to determine an effective low energy Hamiltonian. Through an exhaustive parameter search we find numerically optimized parameters to very well describe the experimentally observed modes, which corroborate the importance of significant magnetic anisotropy in the system. |
| title | Low-energy spin excitations in field-induced phases of the spin-ladder antiferromagnet BiCu$_2$PO$_6$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.20103 |