Effects of Sr substitution on dimensionality and superconducting properties of Hg0.7Pb0.3Ba2Ca2Cu3Oy
Yi Zhuo, Su-Mi Oh, Jae-Hyuk Choi, Mun-Seog Kim, Sung-Ik Lee, N. P. Kiryakov, M. S. Kuznetsov, Sergey Lee
DOI 10.1103/PhysRevB.60.13094 · Physical Review B
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Abstract
The effects of Sr substitution on the Ba site for Hg0.7Pb0.3Ba2Ca2Cu3Oy superconductors were studied. The irreversibility line for the Sr-substituted compound is much steeper compared to the pristine sample. From the analysis of the reversible magnetization, we found that the fluctuation magnetization is much suppressed in the Sr-substituted compound, though the high-field magnetization data around Tc(H) still displayed two-dimensional scaling behavior. This feature can be explained by the enhanced interlayer coupling strength associated with the Sr substitution. Various thermodynamic parameters were obtained from the theoretical analysis. It is notable that the zero-temperature upper critical field Hc2(0) of the Sr-substituted sample is about two times that of the nonsubstituted sample.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Hg0.7Pb0.3Ba2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 127 | Pressure unresolved | onset |
| Hg0.7Pb0.3Sr2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure unresolved | onset |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure unresolved | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 164 | Pressure not reported | unknown |
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