Absence of Cu2+ electron-spin resonance in high-temperature superconductors and related insulators up to 1150 K
- Author(s): Simon, P
- Bassat, JM
- Oseroff, SB
- Fisk, Z
- Cheong, SW
- Wattiaux, A
- Schultz, S
- et al.
Published Web Locationhttps://doi.org/10.1103/PhysRevB.48.4216
One unresolved question in the high-temperature superconductors and their copper oxide parent compounds is the absence of a Cu2+ electron-spin-resonance (ESR) signal even at temperatures well above the Néel temperature. We have extended the measurements up to 1150 K in both single crystals and ceramic pellets of La2CuO4+, 00.12, and no ESR signal has been observed. Our data are not compatible with the models based only on magnetic fluctuations which predict an ESR linewidth of a few hundred Oe at such high temperatures. Other suggested explanations for the absence of a Cu2+ ESR signal are discussed. © 1993 The American Physical Society.
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