Related papers: Probing the Meissner effect in pressurized bilayer nickelate superconductors using diamond quantum sensors

Probing the Meissner effect in pressurized bilayer nickelate superconductors using diamond quantum sensors

URL: http://arxiv.org/abs/2410.10275v1
Date: Mon, 14 Oct 2024 08:23:33 GMT
Title: Probing the Meissner effect in pressurized bilayer nickelate superconductors using diamond quantum sensors
Authors: Junyan Wen, Yue Xu, Gang Wang, Ze-Xu He, Yang Chen, Ningning Wang, Tenglong Lu, Xiaoli Ma, Feng Jin, Liucheng Chen, Miao Liu, Jing-Wei Fan, Xiaobing Liu, Xin-Yu Pan, Gang-Qin Liu, Jinguang Cheng, Xiaohui Yu,
Abstract summary: There is no clear evidence of superconducting diamagnetism in pressurized $mathrmLa_3Ni_2O_7-delta$. Raman spectra and NV-based magnetic imaging indicate an incomplete structural transformation related to the displacement of oxygen ions emerging in the non-superconducting region.
Score: 23.682344072264915
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Recent reports on the signatures of high-temperature superconductivity with a critical temperature Tc close to 80 K have triggered great research interest and extensive follow-up studies. Although zero-resistance state has been successfully achieved under improved hydrostatic pressure conditions, there is no clear evidence of superconducting diamagnetism in pressurized $\mathrm{La_{3}Ni_{2}O_{7-\delta}}$ due to the low superconducting volume fraction and limited magnetic measurement techniques under high pressure conditions. Here, using shallow nitrogen-vacancy centers implanted on the culet of diamond anvils as in-situ quantum sensors, we observe convincing evidence for the Meissner effect in polycrystalline samples $\mathrm{La_{3}Ni_{2}O_{7-\delta}}$ and $\mathrm{La_{2}PrNi_{2}O_{7}}$: the magnetic field expulsion during both field cooling and field warming processes. The correlated measurements of Raman spectra and NV-based magnetic imaging indicate an incomplete structural transformation related to the displacement of oxygen ions emerging in the non-superconducting region. Furthermore, comparative experiments on different pressure transmitting media (silicone oil and KBr) and nickelates ($\mathrm{La_{3}Ni_{2}O_{7-\delta}}$ and $\mathrm{La_{2}PrNi_{2}O_{7}}$) reveal that an improved hydrostatic pressure conditions and the substitution of La by Pr in $\mathrm{La_{3}Ni_{2}O_{7-\delta}}$ can dramatically increase the superconductivity. Our work clarifies the controversy about the Meissner effect of bilayer nickelate and contributes to a deeper understanding of the mechanism of nickelate high-temperature superconductors.

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