$La_3Pd_2NaO_9$: A High-Valent Insulating Palladate
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866911108772659200 |
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| author | Yang, Qingqing Guo, Ning Chang, Tieyan Guo, Zheng Wang, Xiaoli Fan, Chuanyan Liu, Chao Han, Lu Li, Feiyu He, Tao Zheng, Qiang Chen, Yu-Sheng Zhang, Junjie |
| author_facet | Yang, Qingqing Guo, Ning Chang, Tieyan Guo, Zheng Wang, Xiaoli Fan, Chuanyan Liu, Chao Han, Lu Li, Feiyu He, Tao Zheng, Qiang Chen, Yu-Sheng Zhang, Junjie |
| contents | A high-valent palladate, $La_3Pd_2NaO_9$, has been synthesized for the first time. Single crystals with dimensions of 20 $μ$m on edge were successfully grown using the flux method at 420 $^o$C and 70 bar oxygen pressure. Energy dispersive spectroscopy (EDS) and inductively coupled plasma mass spectroscopy (ICP) measurements show that the atomic ratio of La: (Pd+Na) is 3: 3 and Pd: Na is 2: 1. X-ray photoelectron spectroscopy (XPS) measurements show that the oxidation state of Pd is dominated by +4. Synchrotron X-ray single-crystal diffraction measurements revealed that this material crystallizes in the monoclinic $P2_1/c$ space group with charge ordering of Na and Pd. Real-space imaging via scanning transmission electron microscopy (STEM) confirmed the crystal structure and revealed excellent sample homogeneity. Electrical resistivity measurements show an insulating behavior. Magnetic measurements show an unexpected paramagnetic behavior, which probably originate from a small fraction of high-spin Pd$^{2+}$ evidenced by XPS. The successful growth of $La_3Pd_2NaO_9$ single crystals with a high-valent oxidation state of Pd offers an approach for exploring interesting palladates, including potential bilayer Ruddlesden-Popper palladates analogous to the high temperature superconducting $La_3Ni_2O_7$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_15966 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $La_3Pd_2NaO_9$: A High-Valent Insulating Palladate Yang, Qingqing Guo, Ning Chang, Tieyan Guo, Zheng Wang, Xiaoli Fan, Chuanyan Liu, Chao Han, Lu Li, Feiyu He, Tao Zheng, Qiang Chen, Yu-Sheng Zhang, Junjie Strongly Correlated Electrons Materials Science A high-valent palladate, $La_3Pd_2NaO_9$, has been synthesized for the first time. Single crystals with dimensions of 20 $μ$m on edge were successfully grown using the flux method at 420 $^o$C and 70 bar oxygen pressure. Energy dispersive spectroscopy (EDS) and inductively coupled plasma mass spectroscopy (ICP) measurements show that the atomic ratio of La: (Pd+Na) is 3: 3 and Pd: Na is 2: 1. X-ray photoelectron spectroscopy (XPS) measurements show that the oxidation state of Pd is dominated by +4. Synchrotron X-ray single-crystal diffraction measurements revealed that this material crystallizes in the monoclinic $P2_1/c$ space group with charge ordering of Na and Pd. Real-space imaging via scanning transmission electron microscopy (STEM) confirmed the crystal structure and revealed excellent sample homogeneity. Electrical resistivity measurements show an insulating behavior. Magnetic measurements show an unexpected paramagnetic behavior, which probably originate from a small fraction of high-spin Pd$^{2+}$ evidenced by XPS. The successful growth of $La_3Pd_2NaO_9$ single crystals with a high-valent oxidation state of Pd offers an approach for exploring interesting palladates, including potential bilayer Ruddlesden-Popper palladates analogous to the high temperature superconducting $La_3Ni_2O_7$. |
| title | $La_3Pd_2NaO_9$: A High-Valent Insulating Palladate |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2506.15966 |