 Bulk high-temperature superconductivity in pressurized tetragonal La2PrNi2O7Ningning Wang (),
Gang Wang,
Xiaoling Shen,
Jun Hou,
Jun Luo,
Xiaoping Ma,
Huaixin Yang,
Lifen Shi,
Jie Dou,
Jie Feng,
Jie Yang,
Yunqing Shi,
Zhian Ren,
Hanming Ma,
Pengtao Yang,
Ziyi Liu,
Yue Liu,
Hua Zhang,
Xiaoli Dong,
Yuxin Wang,
Kun Jiang,
Jiangping Hu,
Shoko Nagasaki,
Kentaro Kitagawa,
Stuart Calder,
Jiaqiang Yan,
Jianping Sun,
Bosen Wang,
Rui Zhou (),
Yoshiya Uwatoko () and
Jinguang Cheng ()
Nature, 2024, vol. 634, issue 8034, 579-584 Abstract: Abstract The Ruddlesden–Popper (R–P) bilayer nickelate, La3Ni2O7, was recently found to show signatures of high-temperature superconductivity (HTSC) at pressures above 14 GPa (ref. 1). Subsequent investigations achieved zero resistance in single-crystalline and polycrystalline samples under hydrostatic pressure conditions2–4. Yet, obvious diamagnetic signals, the other hallmark of superconductors, are still lacking owing to the filamentary nature with low superconducting volume fraction2,4,5. The presence of a new 1313 polymorph and competing R–P phases obscured proper identification of the phase for HTSC6–9. Thus, achieving bulk HTSC and identifying the phase at play are the most prominent tasks. Here we address these issues in the praseodymium (Pr)-doped La2PrNi2O7 polycrystalline samples. We find that substitutions of Pr for La effectively inhibit the intergrowth of different R–P phases, resulting in a nearly pure bilayer structure. For La2PrNi2O7, pressure-induced orthorhombic to tetragonal structural transition takes place at Pc ≈ 11 GPa, above which HTSC emerges gradually on further compression. The superconducting transition temperatures at 18–20 GPa reach $${T}_{{\rm{c}}}^{{\rm{onset}}}=82.5\,{\rm{K}}$$ T c onset = 82.5 K and $${T}_{{\rm{c}}}^{{\rm{zero}}}=60\,{\rm{K}}$$ T c zero = 60 K , which are the highest values, to our knowledge, among known nickelate superconductors. Importantly, bulk HTSC was testified by detecting clear diamagnetic signals below about 75 K with appreciable superconducting shielding volume fractions at a pressure of above 15 GPa. Our results not only resolve the existing controversies but also provide directions for exploring bulk HTSC in the bilayer nickelates. Date: 2024 Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:634:y:2024:i:8034:d:10.1038_s41586-024-07996-8 Ordering information: This journal article can be ordered from DOI: 10.1038/s41586-024-07996-8 Access Statistics for this article Nature is currently edited by Magdalena Skipper More articles in Nature from Nature |
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