Exploring the Oxygen Order in Hg-1223 and Hg-1201 by 199Hg MAS NMR

TL;DR

This study employs high-resolution 199Hg MAS NMR to map oxygen distribution in Hg-based cuprate superconductors, revealing distinct chemical environments and differences between Hg-1201 and Hg-1223 compounds.

Contribution

It introduces a high-resolution 45 kHz MAS NMR technique to analyze oxygen environments in Hg-based cuprates, providing new insights into their local structure.

Findings

Identified three distinct 199Hg NMR peaks corresponding to different oxygen environments.

Mapped oxygen distribution differences between Hg-1201 and Hg-1223.

Demonstrated the effectiveness of fast MAS NMR in complex cuprate analysis.

Abstract

We demonstrate the use of a high-resolution solid-state fast (45 kHz) magic angle spinning (MAS) NMR for mapping the oxygen distribution in Hg-based cuprate superconductors. We identify observed three peaks in 199Hg spectrum as belonging to the different chemical environments in the HgO? layer with no oxygen neighbors, single oxygen neighbor, and two oxygen neighbors. We discuss observed differences between Hg-1201 and Hg-1223 materials.