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

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

Research output: Contribution to journalArticle

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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 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 languageEnglish (US)
Pages (from-to)1187-1189
Number of pages3
JournalSolid State Communications
Volume67
Issue number12
DOIs
StatePublished - 1988
Externally publishedYes

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Excited states
Superconducting materials
Paramagnetic resonance
insulators
magnetic permeability
excitation
electron paramagnetic resonance
Ions
valence
Temperature
ions
temperature

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 journalArticle

Mehran, F. ; Barnes, Stewart ; Chandrashekhar, G. V. ; McGuire, T. R. ; Shafer, M. W. / Absence of excited triplets in the EPR of the high Tc superconductors and the antiferromagnetic insulator CuO. In: Solid State Communications. 1988 ; Vol. 67, No. 12. pp. 1187-1189.
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