Occurrence of superconductivity in Ca- and Sr-doped PrSr2Cu2.7Mo0.3O7−δ
H. L. Tsay, Y. C. Chen, F. L. Juang, W. M. Wang, H. D. Yang
DOI 10.1103/PhysRevB.53.11340 · Physical Review B
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Abstract
Polycrystalline samples of (Pr1−xMx)Sr2Cu2.7Mo0.3O7−δ (M=Ca and Sr; 0≤x≤0.3;δ∼0.1) with tetragonal perovskitelike structure were synthesized and investigated by powder x-ray-diffraction, electrical-resistivity, magnetic-susceptibility, and specific-heat measurements. Superconductivity can be achieved by partially substituting Ca or Sr for Pr in semiconducting PrSr2Cu2.7Mo0.3O7−δ. The Tc (midpoint) is about 17 K with x=0.1 for both Ca- and Sr-doped systems. The observation of the magnetic shielding effect with powder samples confirms the bulk-nature superconductivity. In addition, the reduced effective magnetic moment μeff (μB/Pr mol) derived from the Curie-Weiss-like magnetic susceptibility of PrSr2Cu2.7Mo0.3O7−δ is found to increase with Ca or Sr doping, while the linear term coefficient γ (mJ/Pr mol K2) of specific heat is almost independent of the doping. These results are discussed in conjunction with hole-filling and hybridization effects for the quenching of superconductivity in PrSr2Cu2.7Mo0.3O7−δ and compared with those in PrBa2Cu3O7−δ. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr0.9Ca0.1Sr2Cu2.7Mo0.3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | midpoint |
| Pr0.9Sr0.1Sr2Cu2.7Mo0.3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | midpoint |
| Pr0.9Ca0.1Sr2Cu2.7Mo0.3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | midpoint |
| Pr0.8Sr0.2Sr2Cu2.7Mo0.3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | midpoint |
| Pr0.8Ca0.2Sr2Cu2.7Mo0.3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | midpoint |
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