Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO

F. Mehran; S. E. Barnes; G. V. Chandrashekhar; T. R. McGuire; M. W. Shafer

doi:10.1016/0038-1098(88)91081-2

Absence of excited triplets in the EPR of the high T_c superconductors and the antiferromagnetic insulator CuO

F. Mehran, S. E. Barnes, G. V. Chandrashekhar, T. R. McGuire, M. W. Shafer

Research output: Contribution to journal › Article › peer-review

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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 Bi₂Sr₂CaCu₂O_x (2212) high T_c ∼80K superconductors, in the YBa₂Cu₃O_x (123) high T_c∼90K superconductors, or in the antiferromagnetic insulator CuO with T_N∼ 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	https://doi.org/10.1016/0038-1098(88)91081-2
State	Published - Sep 1988
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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title = "Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO",

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.",

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T1 - Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO

AU - Mehran, F.

AU - Barnes, S. E.

AU - Chandrashekhar, G. V.

AU - McGuire, T. R.

AU - Shafer, M. W.

PY - 1988/9

Y1 - 1988/9

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.

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Absence of excited triplets in the EPR of the high T_c superconductors and the antiferromagnetic insulator CuO

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