Spin density wave in the bilayered nickelate La3Ni2O7−δ at ambient pressure
Abstract The recent discovery of high-temperature superconductivity in high-pressurized La3Ni2O7−δ has garnered significant attention. Using density functional theory, we investigate the magnetic properties of La3Ni2O7−δ at ambient pressure. Our calculations suggest that with δ = 0, the double spin...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-02-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-025-00740-z |
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| Summary: | Abstract The recent discovery of high-temperature superconductivity in high-pressurized La3Ni2O7−δ has garnered significant attention. Using density functional theory, we investigate the magnetic properties of La3Ni2O7−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 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 S D W . 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 S D W appears insensitive to the variation of samples and the lack of direct evidence for long-range magnetic ordering. |
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| ISSN: | 2397-4648 |