Pressure-Induced Superconductivity In Polycrystalline ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_{7-\delta }$

Journal Article · Wed Mar 06 23:00:00 EST 2024 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.14.011040· OSTI ID:2320288

Wang, G.; Wang, N. N.; Shen, X. L.; Hou, J.; Ma, L.; Shi, L. F.; Ren, Z. A.; Gu, Y. D.; Ma, H. M.; Yang, P. T.; Liu, Z. Y.; Guo, H. Z.; Sun, J. P.; Zhang, G. M.; Calder, S.; Yan, J. -Q.; Wang, B. S.; Uwatoko, Y.; Cheng, J. -G.

We synthesized polycrystalline ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_{7-\delta }$ ( $\delta \approx 0.07$ ) samples by using the sol-gel method without postannealing under high oxygen pressure, and then measured temperature-dependent resistivity under various hydrostatic pressures up to 18 GPa by using the cubic anvil and two-stage multianvil apparatus. We find that the density-wave-like anomaly in resistivity is progressively suppressed with increasing pressure and the resistivity drop corresponding to the onset of superconductivity emerges at pressure as low as $\sim 6\mathrm{GPa}$ . Zero resistivity is achieved at 9 GPa below $T_{\mathrm{c}}^{\mathrm{zero}}\approx 6.6\mathrm{K}$ , which increases quickly with pressure to 41 K at 18 GPa. However, the diamagnetic response was not detected in the ac magnetic susceptibility measurements up to 15 GPa, indicating a filamentary nature of the observed superconductivity in the studied pressure range. The constructed $T\text{−}P$ phase diagram reveals an intimate relationship between superconductivity, density-wave-like order, and the strange-metal-like behaviors. The observation of zero-resistance state in the polycrystalline ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_{7-\delta }$ samples under high pressures not only corroborates the recent report of superconductivity in the pressurized ${\mathrm{La}}_3{\mathrm{Ni}}_2{\mathrm{O}}_7$ crystals but also facilitates further studies on this emerging family of nickelate high- $T_{\mathrm{c}}$ superconductors.

Published by the American Physical Society 2024

• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• OSTI ID: 2320288
• Alternate ID(s): OSTI ID: 2323996
• Journal Information: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 1 Vol. 14; ISSN PRXHAE; ISSN 2160-3308
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English