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 - 1988 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
Cite this
Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO. / Mehran, F.; Barnes, Stewart; Chandrashekhar, G. V.; McGuire, T. R.; Shafer, M. W.
In: Solid State Communications, Vol. 67, No. 12, 1988, p. 1187-1189.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO
AU - Mehran, F.
AU - Barnes, Stewart
AU - Chandrashekhar, G. V.
AU - McGuire, T. R.
AU - Shafer, M. W.
PY - 1988
Y1 - 1988
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000083213&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000083213&partnerID=8YFLogxK
U2 - 10.1016/0038-1098(88)91081-2
DO - 10.1016/0038-1098(88)91081-2
M3 - Article
AN - SCOPUS:0000083213
VL - 67
SP - 1187
EP - 1189
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 12
ER -