Superconducting and magnetic properties of TlSr2Ca1−xRxCu2O7 [R=Pr,Tb]
A. Sundaresan, Aravind D. Chinchure, K. Ghosh, S. Ramakrishnan, V. R. Marathe, L. C. Gupta, M. Sharon, S. S. Shah
DOI 10.1103/PhysRevB.51.3893 · Physical Review B
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Abstract
The magnetic and superconducting properties of the TISr2Ca1−xRxCu2O7 [R=Pr (x=0.2–1.0); Tb (x=0.6 and 1.0)] system are reported. The observation of superconductivity in TISr2Ca0.4Pr0.6Cu2O7 (Tc=74 K) suggests that the Pr ions are in the trivalent state. The value of the effective magnetic moment, μeff=3.15μB, for the TISr2Ca0.4Pr0.6Cu2O7 compound, lies between the free-ion values expected for Pr3+ (3.58 μB) and Pr4+ (2.54μB). The reduced value of μeff for the Pr3+ ion is explained in terms of crystal-field effects. For TISr2TbCu2O7, the Tb magnetic moments order antiferromagnetically at 7.0 K, which is the highest magnetic ordering temperature among the known Tb-containing high-Tc related compounds. Superconductivity (Tc=74 and 62 K) and antiferromagnetic ordering (TN=5 and 6.2 K) coexist in TISr2Ca0.4R0.6Cu2O7 with R=Pr and Tb, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlSr2Ca0.8Pr0.2Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 58 | Pressure not reported | unknown |
| TlSr2Ca0.6Pr0.4Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
| TlSr2Ca0.4Pr0.6Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure not reported | unknown |
| TlSr2Ca0.2Pr0.8Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| TlSr2Ca0.4Tb0.6Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 62 | Pressure not reported | unknown |
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