Superconductivity at 94 K in HgBa2Cu04+δ

S. N. Putilin, E. V. Antipov, O. Chmaissem, M. Marezio

Research output: Contribution to journalArticlepeer-review

1000 Citations (Scopus)


FOLLOWING the discovery1 of high-transition-temperature (high-Tc) superconductivity in doped La2CuO4, several families of related compounds have been discovered which have layers of CuO2 as the essential requirement for superconductivity: the highest transition temperatures so far have been found for thallium-bearing compounds2. Recently the mercury-bearing compound HgBa 2Rcu2O6+δ (Hg-1212) was synthesized 3 (where R is a rare-earth element), with a structure similar to the thallium-bearing superconductor TlBa2CaCu2O7 (Tl-1212), which has one T1O layer and two CuO2 layers per unit cell, and a Tc of 85 K (ref. 2). But in spite of its resemblance to Tl-1212, Hg-1212 was found not to be superconducting. Here we report the synthesis of the related compound HgBa2CuO4+δ (Hg-1201), with only one CuO2 layer per unit cell, and show that it is superconducting below 94 K. Its structure is similar to that of Tl-1201 (which has a Tc of < 10 K)4, but its transition temperature is considerably higher. The availability of a material with high Tc but only a single metal oxide (HgO) layer may be important for technological applications, as it seems that a smaller spacing between CuO 2 planes leads to better superconducting properties in a magnetic field5.

Original languageEnglish
Pages (from-to)226-228
Number of pages3
Issue number6417
Publication statusPublished - 1993
Externally publishedYes


Dive into the research topics of 'Superconductivity at 94 K in HgBa2Cu04+δ'. Together they form a unique fingerprint.

Cite this