Abstract
Gd 1.5Ce 0.5Sr 2Cu 2RuO 10 exhibits antiferromagnetic resonance at 23.9 GHz for applied fields less than 1000 Oe with a spin–spin relaxation time T 2 of approximately 0.45 ns, and with a spin–lattice relaxation time T 1 of at least 320 μs. Since in the homologue, Eu 1.5Ce0 .5Sr 2Cu 2RuO 10, 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 T 1 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.
Published Version
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