Evidence for an interplay between superconductivity and antiferromagnetism of rare-earth ions in Gd1+xBa2−xCu3O7−δ
Krzysztof Rogacki
DOI 10.1103/PhysRevB.68.100507 · Physical Review B
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Abstract
Here, we report on ac susceptibility measurements which reveal an anomaly associated with antiferromagnetic ordering of Gd3+ ions at TN=2.45K in the fully oxygenated superconducting Gd1.2Ba1.8Cu3O7.03 with the critical temperature Tc=42K. This anomaly is explained as a result of the enhanced pair-breaking effect near the magnetic phase transition. This is the first evidence, to our knowledge, that in the high-Tc copper oxides of the Y123-type superconductivity and antiferromagnetic ordering interact in a deep superconducting state (TN≪Tc). No signature of the interaction between conduction electrons and localized magnetic moments is observed for the Gd1+xBa2−xCu3O7−δ compositions with x<~0.1, i.e., Tc>~66K, where superconductivity is strong and masks the effects of magnetic ordering.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Gd1.2Ba1.8Cu3O7.03 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
| Gd1.05Ba1.95Cu3O6.94 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
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