Source zotero
Authors Srinivas V. Mandyam, Esther Wang, Zhipan Wang, Bijuan Chen, Nishan C. Jayarama, Anmay Gupta, Eric A. Riesel, Valery I. Levitas, Christopher R. Laumann, Norman Y. Yao
arXiv / Publisher http://arxiv.org/abs/2510.02429
PDF http://arxiv.org/pdf/2510.02429v1
Relevance score Not available in this batch.
Primary category Not available in this batch.
Published 2025-10-02
Research paradigm Experimental
Sample form Unknown

Summary

The family of nickelate superconductors have long been explored as analogs of the high temperature cuprates. Nonetheless, the recent discovery that certain stoichiometric nickelates superconduct up to high T_c under pressure came as a surprise. The mechanisms underlying the superconducting state remain experimentally unclear. In addition to the practical challenges posed by working in a high pressure environment, typical samples exhibit anomalously weak diamagnetic responses, which have been conjectured to reflect inhomogeneous `filamentary' superconducting states. We perform wide-field, high-pressure, optically detected magnetic resonance spectroscopy to image the local diamagnetic responses of as grown La3Ni2O7 samples emphin situ, using nitrogen vacancy quantum sensors embedded in the diamond anvil cell. These maps confirm significant inhomogeneity of the functional superconducting responses at the few micron scale. By spatially correlating the diamagnetic Meissner response with both the local tensorial stress environment, also imaged emphin situ, and stoichiometric composition, we unravel the dominant mechanisms suppressing and enhancing superconductivity. Our wide-field technique simultaneously provides a broad view of sample behavior and excellent local sensitivity, enabling the rapid construction of multi-parameter phase diagrams from the local structure-function correlations observed at the sub-micron pixel scale.

Materials

Methods

  • optically detected magnetic resonance spectroscopy
  • nitrogen vacancy quantum sensing
  • wide-field imaging

Keywords

Highlights

  • Wide-field quantum sensing technique enables simultaneous broad view and sub-micron local sensitivity.
  • Rapid construction of multi-parameter phase diagrams from local structure-function correlations.

Conclusions

  • Significant inhomogeneity of the functional superconducting responses at the few micron scale is confirmed.
  • Dominant mechanisms suppressing and enhancing superconductivity are unraveled by spatial correlation of diamagnetic response with stress and composition.

Main claims

Not available in this batch.

Workflow

Not available in this batch.