Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system

  title={Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system},
  author={Zhengzhi Sheng and Allen M. Hermann},
The discovery of 30-K superconductivity in the La–Ba–Cu–O system1 and 90-K superconductivity in the Y–Ba–Cu–O system2 stimulated a worldwide search for even higher-temperature superconductors. Unfortunately, most of the higher-temperature transitions reported in the past year have proved to be unstable, irreproducible, or not due to bulk superconductivity3–7. Recently, we and co-workers8,9 reported superconductivity above 90 K in a new Tl–Ba–Cu–O system, and pointed out that elemental… 
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  • 1997
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Preparation and superconducting properties of the (Cu,C)Ba2Ca3Cu4O11+y films with zero-resistance transition temperature of 96 K
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We have discovered reproducible and stable bulk superconductivity in the Tl-Ca-Ba-Cu-0 system with zero resistance above 120 K. Magnetic and electronic transport properties including thermoelectric
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Superconductivity in the rare-earth-free Tl–Ba–Cu–O system above liquid-nitrogen temperature
The initial discovery by Bednorz and Muller1 of 35-K superconduc-tivity in the La–Ba–Cu–O system has stimulated worldwide activity in searching for higher-temperature superconductors. Elemental
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Superconducting La1.8Sr0.2CuO4 has been investigated under pressure. Its resistiveTc-midpoint was found to be 37 K at ambient pressure. It inductively determinedTcis 33 K monotonically shifting up to
Experimental evidence for granular superconductivity in Y-Ba-Cu-O at 100 to 160 K.
It is concluded that there exists grains in the sample with superconducting transition temperatures at least as high as 160 K, and the field dependence of the effect strongly supports this interpretation.
Superconductivity at 93 K in a new mixed-phase Yb-Ba-Cu-O compound system at ambient pressure.
  • Wu, Ashburn, Chu
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    Physical review letters
  • 1987
A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure. An
Superconductivity above 90 K in the square-planar compound system ABa2Cu3O6+x with A=Y, La, Nd, Sm, Eu, Gd, Ho, Er and Lu.
  • Hor, Meng, Chu
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    Physical review letters
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Melt-processible rare earth-Ba-Cu-O superconductors based on molten Ba-Cu oxides
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A two-step resistive transition, one beginning at 240 K and the other at 90 K, has been observed in Y-Ba-Cu-O compounds. The superconductivity, possibly in granular form, at both temperatures has
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Describes construction of an instrument capable of rapid determination of the superconducting transition temperature of powder or single crystal samples. Temperature is varied by use of the