Superconductivity at 124 K in (Tl, Pb)Sr2Ca2Cu3O9

R. S. Liu; S. F. Hu; D. A. Jefferson; P. P. Edwards

doi:10.1016/0921-4534(92)90207-S

Superconductivity at 124 K in (Tl, Pb)Sr₂Ca₂Cu₃O₉

R. S. Liu^*, S. F. Hu, D. A. Jefferson, P. P. Edwards

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

We report the preparation of almost phase pure (Tl_0.5Pb_0.5)Sr₂Ca₂Cu₃O₉, which is characterized by high temperature superconduc tivity with T_{c onset}=130 K, T_{c midpoint}=124 K, T_{c zero}=122.5 K as measured by electrical resistance, and a diamagnetic onset temperature, T_{c mag} of 124 K determined by DC magnetic susceptibility. The new procedure involves synthesizing a material with nominal stoichiometry (Tl_0.5Pb_0.5)Sr_1.6Ca_2.4Cu₃O₉, which is encapsulated in gold foil and sintered at 950°C for 3 h in oxyge n, then sealed in an evacuated quartz tube and finally annealed at 700∼750°C for 5∼10 days. From the results of X-ray diffraction and energy-dispersive X-ray spectrometry (EDS), we have identified the phase responsible for the superconductivity in the annealed sample to be Tl_0.58(3)Pb_0.38(2)Sr_1.9(2)Ca_2.1(1)Cu₃O₉ . No superlattice and intergrowth along the a^* and c^* directions were observed but streaks along the c^*-axis were found from microcrystallites of the annealed sample.

Original language	English
Pages (from-to)	318-322
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	198
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(92)90207-S
Publication status	Published - 1992 Aug 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Superconductivity at 124 K in (Tl, Pb)Sr2Ca2Cu3O9",

abstract = "We report the preparation of almost phase pure (Tl0.5Pb0.5)Sr2Ca2Cu3O9, which is characterized by high temperature superconduc tivity with Tc onset=130 K, Tc midpoint=124 K, Tc zero=122.5 K as measured by electrical resistance, and a diamagnetic onset temperature, Tc mag of 124 K determined by DC magnetic susceptibility. The new procedure involves synthesizing a material with nominal stoichiometry (Tl0.5Pb0.5)Sr1.6Ca2.4Cu3O9, which is encapsulated in gold foil and sintered at 950°C for 3 h in oxyge n, then sealed in an evacuated quartz tube and finally annealed at 700∼750°C for 5∼10 days. From the results of X-ray diffraction and energy-dispersive X-ray spectrometry (EDS), we have identified the phase responsible for the superconductivity in the annealed sample to be Tl0.58(3)Pb0.38(2)Sr1.9(2)Ca2.1(1)Cu3O9 . No superlattice and intergrowth along the a* and c* directions were observed but streaks along the c*-axis were found from microcrystallites of the annealed sample.",

author = "Liu, {R. S.} and Hu, {S. F.} and Jefferson, {D. A.} and Edwards, {P. P.}",

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AU - Liu, R. S.

AU - Hu, S. F.

AU - Jefferson, D. A.

AU - Edwards, P. P.

PY - 1992/8/1

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N2 - We report the preparation of almost phase pure (Tl0.5Pb0.5)Sr2Ca2Cu3O9, which is characterized by high temperature superconduc tivity with Tc onset=130 K, Tc midpoint=124 K, Tc zero=122.5 K as measured by electrical resistance, and a diamagnetic onset temperature, Tc mag of 124 K determined by DC magnetic susceptibility. The new procedure involves synthesizing a material with nominal stoichiometry (Tl0.5Pb0.5)Sr1.6Ca2.4Cu3O9, which is encapsulated in gold foil and sintered at 950°C for 3 h in oxyge n, then sealed in an evacuated quartz tube and finally annealed at 700∼750°C for 5∼10 days. From the results of X-ray diffraction and energy-dispersive X-ray spectrometry (EDS), we have identified the phase responsible for the superconductivity in the annealed sample to be Tl0.58(3)Pb0.38(2)Sr1.9(2)Ca2.1(1)Cu3O9 . No superlattice and intergrowth along the a* and c* directions were observed but streaks along the c*-axis were found from microcrystallites of the annealed sample.

AB - We report the preparation of almost phase pure (Tl0.5Pb0.5)Sr2Ca2Cu3O9, which is characterized by high temperature superconduc tivity with Tc onset=130 K, Tc midpoint=124 K, Tc zero=122.5 K as measured by electrical resistance, and a diamagnetic onset temperature, Tc mag of 124 K determined by DC magnetic susceptibility. The new procedure involves synthesizing a material with nominal stoichiometry (Tl0.5Pb0.5)Sr1.6Ca2.4Cu3O9, which is encapsulated in gold foil and sintered at 950°C for 3 h in oxyge n, then sealed in an evacuated quartz tube and finally annealed at 700∼750°C for 5∼10 days. From the results of X-ray diffraction and energy-dispersive X-ray spectrometry (EDS), we have identified the phase responsible for the superconductivity in the annealed sample to be Tl0.58(3)Pb0.38(2)Sr1.9(2)Ca2.1(1)Cu3O9 . No superlattice and intergrowth along the a* and c* directions were observed but streaks along the c*-axis were found from microcrystallites of the annealed sample.

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Superconductivity at 124 K in (Tl, Pb)Sr₂Ca₂Cu₃O₉

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