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… 
High-temperature superconducting materials: a decade of impressive advancement of T/sub c/
  • C. Chu
  • Physics
    IEEE Transactions on Applied Superconductivity
  • 1997
In the decade after the discovery of high-temperature superconductivity, more than one hundred non-intermetallic compounds have been found to superconduct above 23 K, which is the record transition
Tl-Based Cu-O High Temperature Superconductors
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
High Temperature Cuprate Superconductors and Later Discoveries
The discovery of superconductivity at 30 K in an oxygen deficient La4Ba1Cu5O5(3−y) compound by Bednorz and Muller in 1986 lifted the despondency under which the superconductivity community was
Properties of high Tc superconducting oxides
With the recent discovery of superconductivity at temperatures exceeding 30 K1 and the rapid follow-up discovery of superconductivity at temperatures exceeding 90 K,2 an unprecedented worldwide
The Rise of Tc: A Promising Paradigm via Interfacial Mechanism
Following the seminal detection of superconductivity at 35 K in the first cuprate high temperature superconductor Ba-doped ternary LCO (La214) by Mueller and Bednorz in 1986, the discovery of the


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
Observation of possible superconductivity at 230 K
Recently, Chu1 announced the observation of sharp drops of up to two orders of magnitude in the resistance of several Y-, Sc- and La-based multi-phase Ba–Cu oxide samples at temperatures as high as
Possible highTc superconductivity in the Ba−La−Cu−O system
Metallic, oxygen-deficient compounds in the Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form. Samples withx=1 and 0.75,y>0, annealed below 900°C
Superconductivity at 155 K.
The accomplishment of high-temperature superconductivity is of immense scientific and technological importance. Several critical transition-temperature barriers have recently been breached since the
Structure and superconductivity of La1.8Sr0.2CuO4 and multi-phase Y1.2Ba0.8CuO4 under high pressure
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.
New superconducting cuprate perovskites.
Ten new superconducting cuprate perovskites with T/sub c/'s above 77 K are reported, and Miessner effect and ac susceptibility measurements indicate bulk superconductivity in these materials.
Superconductivity at 93 K in a new mixed-phase Yb-Ba-Cu-O compound system at ambient pressure.
  • Wu, Ashburn, Chu
  • Physics
    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
  • Physics
    Physical review letters
  • 1987
The results suggest that the unique square planar Cu atoms, each surrounded by four or six oxygen atoms, are crucial to the superconductivity of oxides in general.
Melt-processible rare earth-Ba-Cu-O superconductors based on molten Ba-Cu oxides
Ba‐Cu oxides with certain compositions were found to be meltable or partly meltable at a relatively low temperature of 950 °C. High‐quality, dense, and void‐free high‐temperature superconductors