Abstract
We have been unable to observe electron paramagnetic resonance signals at temperatures of up to ∼ 570K from either the S= 1 2 Cu2+ ions or the S = 1 excited states of the Cu2+ - Cu2+ pairs in the new Bi2Sr2CaCu2Ox (2212) high Tc ∼80K superconductors, in the YBa2Cu3Ox (123) high Tc∼90K superconductors, or in the antiferromagnetic insulator CuO with TN∼ 230K. No present theory of the finite spin susceptibility in the paramagnetic state is compatible with the absence of EPR. Short-range resonating-valence-bond (RVB) theory gives zero spin susceptibility at low temperatures, but the absence of the S = 1 excited states of pairs appears to eliminate that theory as well.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1187-1189 |
| Number of pages | 3 |
| Journal | Solid State Communications |
| Volume | 67 |
| Issue number | 12 |
| DOIs | |
| State | Published - Sep 1988 |
| Externally published | Yes |
ASJC Scopus subject areas
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry
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Mehran, F., Barnes, S. E., Chandrashekhar, G. V., McGuire, T. R., & Shafer, M. W. (1988). Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO. Solid State Communications, 67(12), 1187-1189. https://doi.org/10.1016/0038-1098(88)91081-2