Physics – Condensed Matter – Superconductivity
Scientific paper
2001-08-09
Physics
Condensed Matter
Superconductivity
Submitted to Physica C, 16 pages PDF
Scientific paper
We report the results from a 17O Nuclear Magnetic Resonance (NMR) study of the high temperature superconducting cuprate (HTSC), RuSr2EuCu2O8. This compound has recently been found to exhibit the coexistence of magnetic order and superconductivity. At 9 T, the magnetic order in the RuO2 layers is predominately ferromagnetic. We measured the 17O NMR spectra from 10 K to 330 K and find the occurrence of an increasing 17O NMR shift with increasing temperature for temperatures above ~200 K, providing direct evidence that RuSr2RCu2O8 is similar to a very underdoped HTSC. The analysis of the NMR shift and spectral width of the 17O NMR line gives a small but measurable hyperfine field of ~9 mT from the Ru moment at the oxygen site in the copper oxygen planes. We show that the 17O NMR linewidth is governed by dipolar contributions from the Ru moment.
Kramer Simon
Williams Grant V. M.
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