Title

Antiferromagnetism and Superconductivity: Determination of the Cu Spin-Spin Relaxation Time T₂ and the Spin-Lattice Relaxation Time T₁ in Gd₁.₅Ce₀.₅Sr₂Cu₂RuO₁₀

Abstract

Gd1.5Ce0.5Sr2Cu2RuO10 exhibits antiferromagnetic resonance at 23.9 GHz for applied fields less than 1000 Oe with a spin-spin relaxation time T2 of approximately 0.45 ns, and with a spin-lattice relaxation time T1 of at least 320 μs. Since in the homologue, Eu1.5Ce0.5Sr2Cu2RuO10, the Ru atoms evidently fail to exhibit magnetic order, the antiferromagnetic resonance must arise from the cuprate planes. In other homologues, the cuprate planes are known to order ferromagnetically and are stacked in an antiferromagnetic configuration. The large value of T1 suggests that phonon mediation plays no role in high temperature superconductivity. In addition, the presence of ferromagnetic cuprate planes is inconsistent with spin-fluctuation models of high temperature superconductivity.

Department(s)

Physics

Sponsor(s)

United States. Department of Energy

Keywords and Phrases

Antiferromagnetism; Superconductivity

International Standard Serial Number (ISSN)

0038-1098

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 Elsevier, All rights reserved.

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