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PreprintCC BY 4.0arXiv

Regulating oxygen content and superconductivity in La3Ni2O7+δ

  • Peiyue Ma
  • Jingyuan Li
  • Xing Huang
  • Yixing Zhao
  • Yifeng Han
  • Mengwu Huo
  • Deyuan Hu
  • Chaoxin Huang
  • Hengyuan Zhang
  • Sihao Deng
  • Lunhua He
  • Juan Rodriguez-Carvajal
8 more authors
  • Abhisek Bandyopadhyay
  • Alessandro Puri
  • Devashibhai Adroja
  • Xiang Chen
  • Tao Xie
  • Zhen Chen
  • Hualei Sun
  • Meng Wang
Open at sourcePDFDOICite

Abstract

The synthesis of high-quality Ruddlesden-Popper (RP) nickelates remains challenging due to variations in oxygen content and the prevalence of intergrown RP phases. Precisely controlling the stoichiometry and characterizing the resulting physical properties are essential for understanding the mechanism of high-Tc superconductivity in these materials. In this work, we synthesize a series of La3Ni2O7+δ samples with systematically controlled oxygen content and perform comprehensive structural and compositional analyses. Precise oxygen tuning enables us to tailor the microstructure, yielding a pure bilayer phase, a mixture of bilayer and hybrid single-layer-bilayer phases, and a predominantly bilayer phase containing trilayer intergrowths. High-pressure transport measurements reveal distinct superconducting transitions with contrasting Tc values, corresponding to the bilayer phase, the hybrid phase, and trilayer inclusions. Notably, we find that oxygen content not only governs the phase purity−i.e., the presence of intergrowth phases−but also directly modulates the upper critical field (Hc2) of the bilayer superconductivity. By establishing a phase diagram of Tc and Hc2 as functions of oxygen content in La3Ni2O7+δ, this work advances synthetic control and provides new insights into the superconducting mechanism of RP nickelates.

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Cite

BibTeXRIS
BibTeX
@misc{ma2026regulating,
  title = {{Regulating oxygen content and superconductivity in La$_3$Ni$_2$O$_7+δ$}},
  author = {Peiyue Ma and Jingyuan Li and Xing Huang and Yixing Zhao and Yifeng Han and Mengwu Huo and Deyuan Hu and Chaoxin Huang and Hengyuan Zhang and Sihao Deng and Lunhua He and Juan Rodriguez-Carvajal and Abhisek Bandyopadhyay and Alessandro Puri and Devashibhai Adroja and Xiang Chen and Tao Xie and Zhen Chen and Hualei Sun and Meng Wang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.04562},
  eprint = {2605.04562},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.04562},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Regulating oxygen content and superconductivity in La_3Ni_2O_7+δ
AU  - Peiyue Ma
AU  - Jingyuan Li
AU  - Xing Huang
AU  - Yixing Zhao
AU  - Yifeng Han
AU  - Mengwu Huo
AU  - Deyuan Hu
AU  - Chaoxin Huang
AU  - Hengyuan Zhang
AU  - Sihao Deng
AU  - Lunhua He
AU  - Juan Rodriguez-Carvajal
AU  - Abhisek Bandyopadhyay
AU  - Alessandro Puri
AU  - Devashibhai Adroja
AU  - Xiang Chen
AU  - Tao Xie
AU  - Zhen Chen
AU  - Hualei Sun
AU  - Meng Wang
PY  - 2026
DA  - 2026/10/07
PB  - arXiv
DO  - 10.48550/arxiv.2605.04562
UR  - https://arxiv.org/abs/2605.04562
AB  - The synthesis of high-quality Ruddlesden-Popper (RP) nickelates remains challenging due to variations in oxygen content and the prevalence of intergrown RP phases. Precisely controlling the stoichiometry and characterizing the resulting physical properties are essential for understanding the mechanism of high-T_c superconductivity in these materials. In this work, we synthesize a series of La_3Ni_2O_7+δ samples with systematically controlled oxygen content and perform comprehensive structural and compositional analyses. Precise oxygen tuning enables us to tailor the microstructure, yielding a pure bilayer phase, a mixture of bilayer and hybrid single-layer-bilayer phases, and a predominantly bilayer phase containing trilayer intergrowths. High-pressure transport measurements reveal distinct superconducting transitions with contrasting T_c values, corresponding to the bilayer phase, the hybrid phase, and trilayer inclusions. Notably, we find that oxygen content not only governs the phase purity−i.e., the presence of intergrowth phases−but also directly modulates the upper critical field (H_c2) of the bilayer superconductivity. By establishing a phase diagram of T_c and H_c2 as functions of oxygen content in La_3Ni_2O_7+δ, this work advances synthetic control and provides new insights into the superconducting mechanism of RP nickelates.
ER  -