Phase separation observed by 1H-NMR in YBa2Cu3O7-δHx

被引：29

作者：

Gross, J. ^{[1
]}

Mehring, M. ^{[1
]}

机构：

[1] Universitaet Stuttgart, Stuttgart, Germany

来源：

Physica C: Superconductivity and its Applications | 1992年 / 203卷 / 1-2期

关键词：

Antiferromagnetism - Copper oxides - Hydrogen - Mathematical models - Nuclear magnetic resonance - Phase interfaces - Protons - Spectrum analysis - Yttrium compounds;

D O I：

10.1016/0921-4534(92)90501-3

中图分类号：

学科分类号：

摘要：

We report on 1H-NMR experiments on protonated samples of YBa2Cu3O7-δ. Phase separation into an antiferromagnetic (AFM) phase with high 1H-concentration and a metallic/superconducting (SC) phase with a low 1H-concentration is observed. Cooling experiments suggest that this phase separation takes place already during the protonation process. Even unprotonated samples show high proton background 1H-NMR signals (about 0.25 1Hs per unit cell). Comparison of the linewidth of the AFM spectra with model calculations leads us to the conclusion that the protons in the AFM phase are located within 1.2 Angstroms above or below the Cu-chain layer.

引用

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