Superconductivity above 130 K in the Hg–Ba–Ca–Cu–O system

  title={Superconductivity above 130 K in the Hg–Ba–Ca–Cu–O system},
  author={Andreas Schilling and Marco Cantoni and J D Guo and H. R. Ott},
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 in suitably structured (layered) materials. Previous experience with similar compounds containing bismuth and thallium instead of mercury suggested that even higher transition temperatures might be achieved in mercury-based compounds with more than one CuO2 layer per unit cell. Here we provide support… Expand
Superconductivity at higher temperatures in the Hg-Ba-Ca-Cu-O compound system
Our recent systematic examination of the pressure effect on high-temperature superconductors revealed that the highest achievable superconducting transition temperature (Tc) in the layered cupratesExpand
High current densities above 100 K in the high-temperature superconductor HgBa2CaCu2O6+δ
THE recent discovery1,2 of a family of mercury-based copper oxide superconductors having transition temperatures1–3 above 130 K is of considerable technological interest. But the viability ofExpand
Physical and structural aspects of the 130 K superconductor in the Hg-Ba-Ca-Cu-O system
Samples containing HgBa2Ca2Cu3O8+δ (Hg-1223) as the main phase were investigated. Our specific-heat results confirm the bulk nature of superconductivity below T c ≈ 133 K. From the location of theExpand
On the structural transition of the Hg–Ba–Ca–Cu–O HTSC phase to long-period polytypic structures as a result of Tl, Pb Doping On Hg sites
Abstract In the case of Hg-bearing cuprate high temperature superconductors, the great flexibility of rock salt layers permits the introduction of suitable cations to substitute for Hg in the Hg-OExpand
High-pressure synthesis and superconductivity of a Ba free mercury-based superconductor (Hg0.75Re0.25)Sr2Ca2Cu3Oy
Abstract A Ba free mercury-based cupric oxide superconductor (Hg 0.75 Re 0.25 )Sr 2 Ca 2 Cu 3 O y was prepared at 6 GPa and 1273 K. The quarter substitution of Re for Hg was found to be essential toExpand
Pressure-Induced Enhancement of Tc Above 150 K in Hg-1223
Temperature-dependent electrical resistivity measurements under pressure on a (> 95%) pure Hg-1223 phase are reported and strongly suggests that higher critical temperatures could be obtained at atmospheric pressure. Expand
Single crystal study of the “1201” superconductor Hg0.8Bi0.2Ba2CuO4+δ
Abstract Single crystals of the “1201” mercury based cuprate have been grown for the first time. Their structure determination allows the classical Jahn-Teller distortion of the octahedral copperExpand
Superconductivity above 100 K in compounds containing Hg
The results of studies of new Hg based cuprate superconductors are reported. Several members of a new family of (Hg,Tl)(Ba,Sr)Can−2CunOx high temperature superconductors have been synthesized. TheseExpand
Synthesis and Superconductivity of Hg-Ba-Ca-Cu-O Superconductors
The compositions, crystal structures and superconducting properties of Hg-Ba-Ca-Cu-O superconductors were investigated. Nearly single-phase samples of HgBa2CuO4+ δ (Hg-1201) and HgBa2CaCu2O6+ δExpand
High pressure effects revisited for the cuprate superconductor family with highest critical temperature
A systematic study of the pressure dependence of Tc in HgBa2Ca2Cu3O8+δ (Hg1212) and Hg1223 with the doping level from underdoped to overdoped is reported and a maximum Tc of 153 K at 22 GPa is confirmed in slightly underdoping Hg 1223. Expand


Superconductivity at 94 K in HgBa2Cu04+δ
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 theExpand
Bulk Superconductivity at 125 K in Tl 2 Ca 2 Ba 2 Cu 3 O x
Bulk superconductivity is reported in T12Ca2 Ba2 Cu3 Ox with a transition to zero resistance at ≃ 125 K, the highest transition temperature (Tc) yet found. Transmission electron spectroscopy showsExpand
Zero-resistance temperature of Tl-based “2223” superconductor increased to 127 K
Abstract It is demonstrated that a single-phase “2223” superconductor, i.e. Tl 1.7 Ba 2 Ca 2.3 Cu 3 O z , exhibits the zero-resistance temperature at 127 K and the diamagnetic onset temperature atExpand
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
Tl1Can−1Ba2CunO2n+3 (n= 1,2,3): a new class of crystal structures exhibiting volume superconductivity at up to ≃ 110 K
We report the discovery of three new phases in the Tl-Ca-Ba-Cu-O system, Tl/sub 1/Ca/sub n//sub -1/Ba/sub 2/Cu/sub n/O/sub 2//sub n//sub +3/ (n = 1,2,3), one of which (n = 3) exhibits bulkExpand
Bulk superconductivity at 125 K in Tl/sub 2/Ca/sub 2/Ba/sub 2/Cu/sub 3/O/sub x/
Bulk superconductivity is reported in Tl/sub 2/Ca/sub 2/Ba/sub 2/Cu/sub 3/O/sub x/ with a transition to zero resistance at approx. =125 K, the highest transition temperature (T/sub c/) yet found.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