Dynamic correlated Cu(2) magnetic moments in superconducting YBa2(Cu0.96Co0.04)3Oy(y∼7)
J. A. Hodges, P. Bonville, A. Yaouanc, P. Dalmas de Réotier, X. Chaud, S. P. Cottrell
DOI 10.1103/PhysRevB.80.214505 · Physical Review B
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Abstract
We have examined the magnetic properties of superconducting YBa2(Cu0.96Co0.04)3Oy(y∼7,Tsc=65 K) using elastic neutron scattering and muon spin relaxation (μSR) on single-crystal samples. The elastic-neutron-scattering measurements evidence magnetic reflections, which correspond to a commensurate antiferromagnetic Cu(2) magnetic structure with an associated Néel temperature TN∼400 K. This magnetically correlated state is not evidenced by the μSR measurements. We suggest that this apparent anomaly arises because the magnetically correlated state is dynamic in nature. It fluctuates with rates that are low enough for it to appear static on the time scale of the elastic-neutron-scattering measurements, whereas on the time scale of the μSR measurements, at least down to ∼50 K, it fluctuates too fast to be detected. The different results confirm the conclusions reached from work on equivalent polycrystalline compounds: the evidenced fluctuating, correlated Cu(2) moments coexist at an atomic level with superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2(Cu0.96Co0.04)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
| YBa2(Cu0.96Co0.04)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
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