High-temperature 17O NMR as a probe of electron localization and structure in transition metal oxides

✍ Scribed by Stuart B. Adler; Jeffrey A. Reimer

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 635 KB
• Volume: 91
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)83017-7

✦ Synopsis

Oxygen-17 NMR measurements were used to probe the electronic structure in two transition metal oxides:

(Lao,6Sr,,,)(Co,,Cu,,)oy and (Lao,sBao,~)(Co,,Cu,3)OF. We find that the shift of the resonance in both materials can be deconvoluted into a temperature independent Knight shift and a temperature dependent Curie-Weiss shift, suggesting that localized and delocalized electrons exist simultaneously at high temperature. We discuss these observations in light of the complex local structure found within these materials.