Spin density wave in the bilayered nickelate La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866915079826440192 |
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| author | Ni, Xiao-Sheng Ji, Yuyang He, Lixin Xie, Tao Yao, Dao-Xin Wang, Meng Cao, Kun |
| author_facet | Ni, Xiao-Sheng Ji, Yuyang He, Lixin Xie, Tao Yao, Dao-Xin Wang, Meng Cao, Kun |
| contents | The recent discovery of high-temperature superconductivity in high-pressurized La$_3$Ni$_2$O$_{7-δ}$ has garnered significant attention. Using density functional theory, we investigate the magnetic properties of La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure. Our calculations suggest that with $δ=0$, the double spin stripe phase is favored as the magnetic ground state. Oxygen vacancies may effectively turn nearest Ni spins into \textit{charge} sites. Consequently, with moderate $δ$ values, our theoretical magnetic ground state exhibits characteristics of both double spin stripe and spin-charge stripe configurations, providing a natural explanation to reconcile the seemingly contradictory experimental findings that suggest both the configurations as candidates for the spin-density-wave phase. With higher $δ$ values, we anticipate the ground state to become a spin-glass-like noncollinear magnetic phase with only short-range order. The oxygen vacancies are expected to significantly impact the magnetic excitations and the transition temperatures $T_{SDW}$. Notably, the magnetic ordering also induces concomitant charge ordering and orbital ordering, driven by spin-lattice coupling under the low symmetry magnetic order. We further offer a plausible explanation for the experimental observations that the measured $T_{SDW}$ appears insensitive to the variation of samples and the lack of direct evidence for long-range magnetic ordering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_19213 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin density wave in the bilayered nickelate La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure Ni, Xiao-Sheng Ji, Yuyang He, Lixin Xie, Tao Yao, Dao-Xin Wang, Meng Cao, Kun Materials Science Superconductivity The recent discovery of high-temperature superconductivity in high-pressurized La$_3$Ni$_2$O$_{7-δ}$ has garnered significant attention. Using density functional theory, we investigate the magnetic properties of La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure. Our calculations suggest that with $δ=0$, the double spin stripe phase is favored as the magnetic ground state. Oxygen vacancies may effectively turn nearest Ni spins into \textit{charge} sites. Consequently, with moderate $δ$ values, our theoretical magnetic ground state exhibits characteristics of both double spin stripe and spin-charge stripe configurations, providing a natural explanation to reconcile the seemingly contradictory experimental findings that suggest both the configurations as candidates for the spin-density-wave phase. With higher $δ$ values, we anticipate the ground state to become a spin-glass-like noncollinear magnetic phase with only short-range order. The oxygen vacancies are expected to significantly impact the magnetic excitations and the transition temperatures $T_{SDW}$. Notably, the magnetic ordering also induces concomitant charge ordering and orbital ordering, driven by spin-lattice coupling under the low symmetry magnetic order. We further offer a plausible explanation for the experimental observations that the measured $T_{SDW}$ appears insensitive to the variation of samples and the lack of direct evidence for long-range magnetic ordering. |
| title | Spin density wave in the bilayered nickelate La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure |
| topic | Materials Science Superconductivity |
| url | https://arxiv.org/abs/2407.19213 |