Superconductivity and magnetism in Eu1−xPrxBa2Cu3O7−δ
G. Nieva, S. Ghamaty, B. W. Lee, M. B. Maple, Ivan K. Schuller
DOI 10.1103/PhysRevB.44.6999 · Physical Review B
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Abstract
Measurements of the electrical resistivity ρ as a function of temperature T, and low-temperature specific heat C as a function of T and magnetic field H, have been performed for Pr concentrations 0≤x≤1 in the Eu1−xPrxBa2Cu3O7−δ system (δ≊0.05). The superconducting critical temperature Tc(x) in the metallic phase (0≤x≲xc≊0.5) was determined from the resistivity ρ(x,T), while the Néel temperature TN(x) in the insulating phase (xc≲x≤1) was inferred from specific-heat anomalies due to antiferromagnetic (AFM) ordering of the Pr ions. The effect of ‘‘chemical’’ pressure on Tc(x) in the Y1−xPrxBa2Cu3O7−δ system is opposite to that of applied hydrostatic pressure. The Pr contributions to the specific heat in the insulating phase have the form C(T)=MT3 for T<TN, characteristic of three-dimensional AFM magnons. In contrast, the Pr contribution to C(T) in the metallic phase takes the form of a broad anomaly that can be described by a spin-1/2 Kondo model. The entropy associated with the Pr specific-heat anomalies in both the metallic and insulating phases is close to R ln2, indicative of a doublet ground state for Pr in the crystalline electric field and a Pr valence close to 4+.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| EuBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.75 | Pressure not reported | midpoint |
| Eu0.95Pr0.05Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.05 | Pressure not reported | midpoint |
| Eu0.9Pr0.1Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.2 | Pressure not reported | midpoint |
| Eu0.8Pr0.2Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57.2 | Pressure not reported | midpoint |
| Eu0.7Pr0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.2 | Pressure not reported | midpoint |
| Eu0.6Pr0.4Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.1 | Pressure not reported | midpoint |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | unknown |
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