Effect of hydrostatic pressure on HgBa2Ca2Cu3O8+δ superconductor doped with Re
M. T. D. Orlando, A. G. Cunha, E. V. L. de Mello, H. Belich, E. Baggio-Saitovitch, A. Sin, X. Obradors, T. Burghardt, A. Eichler
DOI 10.1103/PhysRevB.61.15454 · Physical Review B
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Abstract
Samples of the Hg1−xRexBa2Ca2Cu3O8+δ superconductor (Hg, Re-1223), with varying rhenium (Re) content (0.00<x<0.30) were produced with the help of a thermobaric analysis, which can monitor the total pressure inside the quartz tube during the synthesis at high temperatures. The sample quality was verified by means of Rietveld analysis of the x-ray-diffraction data, ac susceptibility, and by ac resistance measurements. The same procedure was used to prepare all the samples with different Re content (reduction of oxygen content in the precursor RexBa2Ca2Cu3O7+δ and the increase of the mercury partial pressure inside the quartz tube). The Re atoms lead to a reduction of the lattice parameter along the c axis with a decrease of the lattice volume which is equivalent to an applied hydrostatic pressure of 1 GPa. The aim of this work is a comparative and quantitative study of the chemical and external hydrostatic pressure on the Hg, Re-1223 system. The samples with 0.10<x<0.25 showed strong magnetic shielding effects and low residual resistance. Resistance measurements as a function of temperature display an increase of the superconducting transition temperature TC with applied hydrostatic pressure. The ∂TC/∂P value depends strongly on the Re doping and the sample with the Re content x=0.18 showed the largest measured ∂TC/∂P=6.8(2)K/GPa. We argue that the Re concentration does not increase TC in the same way as external hydrostatic pressure but provides a strong influence on the intrinsic term proposed by Almasan et al. [Phys. Rev. Lett. 69, 680 (1992)].
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure unresolved | unknown |
| Hg0.82Re0.18Ba2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | onset |
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