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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.12635 |
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| _version_ | 1866910704925147136 |
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| author | Xie, Tao Huo, Mengwu Ni, Xiaosheng Shen, Feiran Huang, Xing Sun, Hualei Walker, Helen C. Adroja, Devashibhai Yu, Dehong Shen, Bing He, Lunhua Cao, Kun Wang, Meng |
| author_facet | Xie, Tao Huo, Mengwu Ni, Xiaosheng Shen, Feiran Huang, Xing Sun, Hualei Walker, Helen C. Adroja, Devashibhai Yu, Dehong Shen, Bing He, Lunhua Cao, Kun Wang, Meng |
| contents | After several decades of studies of high-temperature superconductivity, there is no compelling theory for the mechanism yet; however, the spin fluctuations have been widely believed to play a crucial role in forming the superconducting Cooper pairs. The recent discovery of high-temperature superconductivity near 80 K in the bilayer nickelate La$_3$Ni$_2$O$_7$ under pressure provides a new platform to elucidate the origins of high-temperature superconductivity. We perform elastic and inelastic neutron scattering studies on a polycrystalline sample of La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure. No magnetic order can be identified down to 10 K. The absence of long-range magnetic order in neutron diffraction measurements may be ascribed to the smallness of the magnetic moment. However, we observe a weak flat spin-fluctuation signal at $\sim$ 45 meV in the inelastic scattering spectra. The observed spin excitations could be interpreted as a result of strong interlayer and weak intralayer magnetic couplings for stripe-type antiferromagnetic orders. Our results provide crucial information on the spin dynamics and are thus important for understanding the superconductivity in La$_3$Ni$_2$O$_7$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12635 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Neutron Scattering Studies on the High-$T_c$ Superconductor La$_3$Ni$_2$O$_{7-δ}$ at Ambient Pressure Xie, Tao Huo, Mengwu Ni, Xiaosheng Shen, Feiran Huang, Xing Sun, Hualei Walker, Helen C. Adroja, Devashibhai Yu, Dehong Shen, Bing He, Lunhua Cao, Kun Wang, Meng Superconductivity Strongly Correlated Electrons After several decades of studies of high-temperature superconductivity, there is no compelling theory for the mechanism yet; however, the spin fluctuations have been widely believed to play a crucial role in forming the superconducting Cooper pairs. The recent discovery of high-temperature superconductivity near 80 K in the bilayer nickelate La$_3$Ni$_2$O$_7$ under pressure provides a new platform to elucidate the origins of high-temperature superconductivity. We perform elastic and inelastic neutron scattering studies on a polycrystalline sample of La$_3$Ni$_2$O$_{7-δ}$ at ambient pressure. No magnetic order can be identified down to 10 K. The absence of long-range magnetic order in neutron diffraction measurements may be ascribed to the smallness of the magnetic moment. However, we observe a weak flat spin-fluctuation signal at $\sim$ 45 meV in the inelastic scattering spectra. The observed spin excitations could be interpreted as a result of strong interlayer and weak intralayer magnetic couplings for stripe-type antiferromagnetic orders. Our results provide crucial information on the spin dynamics and are thus important for understanding the superconductivity in La$_3$Ni$_2$O$_7$. |
| title | Neutron Scattering Studies on the High-$T_c$ Superconductor La$_3$Ni$_2$O$_{7-δ}$ at Ambient Pressure |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2401.12635 |