Dynamic correlated Cu(2) magnetic moments in superconducting YBa2(Cu0.96Ni0.04)3Oy (y∼7)
J. A. Hodges, P. Bonville, A. Forget, A. Yaouanc, P. Dalmas de Réotier, S. P. Cottrell
DOI 10.1103/PhysRevB.80.214504 · Physical Review B
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Abstract
We have examined the magnetic properties of polycrystalline, superconducting YBa2(Cu0.96Ni0.04)3Oy (y∼7, Tsc∼75 K) using two local probe techniques: Y170b Mössbauer down to 0.1 K and muon-spin relaxation (μSR) down to 1.5 K. At 0.1 K, the Y170b measurements show the Cu(2) over essentially all the sample volume carry magnetically correlated moments which are static on the time scale 10−9 s. The moments show a distribution in size. The correlations are probably short range. As the temperature increases, the correlated moments are observed to fluctuate with measurable rates (in the GHz range) which increase as the temperature increases and which show a wide distribution. The μSR measurements also evidence that the fluctuation rates increase with increasing temperature and there is a distribution. 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(Cu0.96Ni0.04)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | onset |
| Y0.975Yb0.025Ba2(Cu0.96Ni0.04)3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | onset |
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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