Superconductivity at 94 K in HgBa2Cu04+δ

  title={Superconductivity at 94 K in HgBa2Cu04+$\delta$},
  author={S. N. Putilin and Evgeny V. Antipov and Omar Chmaissem and Massimo Marezio},
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 HgBa2Rcu2O6+δ (Hg-1212) was synthesized3 (where R is a rare-earth element), with a structure similar to the thallium-bearing… Expand
New family of mercury- and thallium-based superconductors, Hg1−xTlxBa2(Ca0.86Sr0.14)2Cu3O8+δ
New mercury-based. superconductors, Hgl−xTlxBa2(Ca0.86Sr 0.14)2Cu3O 8+δ (x=0.25, 0.50, 0.75; denoted as Hg,Tl-1223), were prepared by solid state reactions of HgO, Tl2O3, Ba2CuO3+x, and Ca0.86SrExpand
Superconductivity above 130 K in the Hg–Ba–Ca–Cu–O system
THE recent discovery1 of superconductivity below a transition temperature (Tc) of 94 K in HgBa2CuO4+δ has extended the repertoire of high-Tc superconductors containing copper oxide planes embedded inExpand
Synthesis of single-phase HgBa2Ca2Cu3O8+δ superconductor
Abstract The third member (Hg-1223) of the recently discovered homologous series HgBa2Can−1CunO2n+2+δ, having a Tc of 118 K (as synthesized sample) and 133 K (oxygen-annealed sample), wasExpand
Crystal chemistry of superconducting mercury-based cuprates and oxycarbonates
The recently discovered mercury-based cuprates represent a large family of high-Tc superconductors, HgBa2Can–1CunO2n+2+δ whose Tc can reach 133 K. They have proved difficult to synthesize as singleExpand
New members in the family of Hg and Tl based superconductors Hg1−xTlxBa2(Ca0.86Sr0.14)2Cu3O8+δ
Abstract A new family of superconducting cuprate oxides based on mercury and thallium, Hg 1− x Tl x Ba 2 ( Ca 0.86 Sr 0.14 ) 2 Cu 3 O 8+ δ (x=0.25, 0.50, 0.75; denoted as Hg, Tl-1223), have beenExpand
Structure, doping and superconductivity in HgBa2CaCu2O6+δ (Tc ⩽ 128 K)
Abstract We have studied the defect structure and superconducting propertiess of HgBa2CaCu2O6+δ by neutron powder diffraction, AC susceptibility and DC resistivity. An as-synthesized sample has anExpand
Synthesis and magnetic characterization of the high-Tc superconducting compound HgBa2CuO4+δ
Bulk superconducting samples of HgBa2CuO4+δ (hereafter denoted as Hg-1201) were prepared by solid state reaction of stoichiometric quantities of HgO and Ba2CuO3 precursors. The “as-synthesized”Expand
Superconductivity above 120 K in HgBa2CaCu2O6+δ
Abstract The second member (Hg-1212) of the recently discovered homologous series HgBa2Can−1CunO2n+2+δ has been synthesized by solid state reaction, carried out at 800°C under 60 kbar. The X-rayExpand
Synthesis and superconductivity of highly underdoped HgBa2CuO4+δ
Abstract The highest transition temperature superconductors are found within the complex homologous series HgBa 2 Ca n −1 Cu n O 2 n +2+ δ ( n =1–7), with the third member, HgBa 2 Ca 2 Cu 3 O 8+ δExpand
Synthesis and characterization of a new mercury-based superconductor, Hg0.5Tl0.5Ba2Ca1-xSrxCu2O6+δ
Abstract A new mercury-based superconductor Hg 0.5 Tl 0.5 Ba 2 Ca 1- x Sr x Cu 2 O 6+ δ ( x = 0.14, denoted as Hg, Tl-1212) was synthesized from the reaction of HgO, Tl 2 O 3 , Ba 2 CuO 3+ x , and CaExpand


TlBa1.2La0.8CuO5: A superconductor produced by reduction, rather than oxidation, of the CuO2 planes
Abstract Doping of La3+ for Ba2+ in TlBa2CuO5, to introduce holes into the CuO2 planes, leads to superconductivity in the material TlBa1.2La0.8CuO5 (with Tc ≈ 52 K). The structure (P4/mmm) has beenExpand
Stabilization of superconductivity in TlBa2CuO5−δ at 9.5 K and its enhancement to 43 K in TlBaSrCuO5−δ
Abstract It is shown that the superconducting state can be stabilized ( T c =9.5 K) by slow-cooling TlBa 2 CuO 5 in a nitrogen environment. Interestingly, partial substitution (50%) of Ba 2+ by Sr +Expand
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°CExpand
Compounds and phase compatibilities in the system Y2O3-BaO-CuO at 950°C
Abstract The subsolidus phase diagram of the system Y2O3-BaO-CuO at 950° C in air has been investigated. In the binary system BaO-CuO the compound Ba2CuO3+δ has been isolated and a new compound withExpand
Model family of high-temperature superconductors: TlmCan-1Ba2CunO2(n+1)+m (m=1,2; n=1,2,3).
  • Parkin, Lee, +4 authors Beyers
  • Physics, Medicine
  • Physical review. B, Condensed matter
  • 1988
Variations in the transition temperatures in the double- and triple-CuO/sub 2/-layer compounds are observed to correlate with increased densities of intergrowths of related structures. Expand
New complex copper oxides: HgBa2RCu2O7 (R = La, Nd, Eu, Gd, Dy, Y)
Abstract A new family of complex copper oxides, HgBa 2 R Cu 2 O 7 ( R = La, Nd, Eu, Gd, Dy, Y), has been synthesized and studied by X-ray powder diffraction, transmission electron microscopy and EDSExpand
Abstract For H‖c-axis, the magnetic field induced broadening of the resistive transitions of high-Tc superconductors (HTS) is shown to depend strongly on the Cu-O layer spacing. For the highlyExpand