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Enhancement of the dielectric constant of Ta2O5through substitution with TiO2
MICROELECTRONICS research is in large part driven by the demand for smaller components with enhanced performance. For capacitive components, which form the basis of many memory devices, the dielectric constant...
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Article
Superconductivity in lanthanum nickel boro-nitride
RESEARCH into intermetallic superconductors has recently been reinvigorated by the discovery of superconductivity at 23 K in a Y–Pd–B–C quaternary alloy1 (tying with the long-standing inter-metallic record held b...
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Article
Superconductivity at 23 K in yttrium palladium boride carbide
COPPER oxide compounds have dominated superconductivity research since 1986 because of their very high transition temperatures (Tcs). In contrast, no new families of high-Tc intermetallic compounds have been disc...
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Article
The crystal structure of superconducting LuNi2B2C and the related phase LuNiBC
SUPERCONDUCTING intermetallic compounds with relatively high transition temperature (Tc) have been found in the systems Ln–Tr–B–C, where Ln is a lanthanide element (Y, Ho–Lu) and Tr a transition metal (Pd or Ni)1...
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Article
Superconductivity in the quaternary intermetallic compounds LnNi2B2C
THE attainment of unprecedentedly high transition temperatures (Tcs) in the copper oxide superconductors illustrates how working with more complex chemical systems allows greater opportunity to balance opposing f...
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Article
Antiferromagnetism and metallic conductivity in Nb12O29
AT the heart of the controversy about the microscopic origin of superconductivity in high-transition-temperature copper oxide superconductors is the question of whether or not the antiferromagnetism associated...
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Article
Superconductivity at 60 K in La2-xSrxCaCu2O6: the simplest double-layer cuprate
STARTING with the pioneering work of Bednorz and Müller1, many copper-oxide-based superconductors with high transition temperatures (Tc) have been discovered. All contain layers of copper-oxygen squares, pyramids...
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Article
Superconductivity at 3.5 K in BaPb0.75Sb0.25O3: why is Tc so low?
SUPERCONDUCTING BaPb0.75Bi0.25O3, with a transition temperature (Tc ) of 12 K (ref. 1), is now widely viewed as the precursor to the recent appearance of copper oxide superconductors with record high Tc S. The ob...
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Article
Synthesis of bulk superconducting YBa2Cu4O8 at one atmosphere oxygen pressure
THE well-known 90-K superconductor Y2Ba2Cu3O7 ('123') is the first (n = 0) member of a homologous series of compounds with the general formula Y2Ba4Cu6+nO14+n. These compounds combine layers of copper–oxygen pyra...
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Article
Superconductivity near 70 K in a new family of layered copper oxides
A new family of high-temperature superconductors is described, with the general formula Pb2Sr2ACu3O8+δ. Although they have the planes of CuO5 square pyramids characteristic of the other copper-oxide superconducto...
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Article
Superconductivity near 30 K without copper: the Ba0.6K0.4BiO3 perovskite
It is well known that the breakthrough of Bednorz and Müller1 in discovering superconductivity in (La, Ba)2CuO4 was inspired in part by their knowledge of the superconducting properties of Ba(Pb, Bi)O3 (ref. 2). ...