Measurement of Local Magnetic Fields in the CuO2 Planes of CuBa2YCu2O7−δ Superconductors
J. Lindén, M. Karppinen, I. Grigoravičiūtė, H. Yamauchi
DOI 10.1103/PhysRevLett.98.067001 · Physical Review Letters
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Abstract
A fully oxygenated Cu(1)Ba2YCu(2)2O7−δ sample having 0.167 at % of the Cu atoms replaced by enriched Fe57 was synthesized. As confirmed by Fe57 Mössbauer spectroscopy ∼16% of the Fe atoms entered the superconducting Cu(2)O2 planes. Mössbauer spectra recorded at various temperatures between 77 and 373 K exhibited the presence of a weak magnetic hyperfine interaction in the Fe atoms entering the CuO2 planes. The nonzero internal field obtained from the Mössbauer data increased following a Brillouin-type behavior, from the estimated Néel-like temperature of ∼400 K down to 96 K where it reached ∼1.5 T. Upon further cooling below Tc the internal field decreased fast down to ∼0.4 T at 77 K. The presence of the internal field is believed to be related to magnetic correlations among the CuO2-plane atoms, i.e., to reflect local antiferromagnetic coupling between the Cu atoms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CuBa2YCu2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
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