A new family of copper oxide superconductors Srn+1CunO2n+1+delta stabilized at high pressure
Article Abstract:
High-pressure synthesis of SRn+1CunO2n+1+delta creates a superconductor at 70 K to 100 K or higher. The family extends from Sr2Cu1O3.1 for n=1, to SrCuO2 for n=infinity. In the latter, which ordinarily lacks the CuO2 sheets thought vital to high-temperature superconductivity, pressure causes a transition to a denser infinite-layer form with CuO2 sheets sandwiching Sr layers. Pressures used went up to 6 GPa; temperatures, 1173 K.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Absence of superconductivity in the doped antiferromagnetic spin-ladder compound (La,Sr)CuO(sub 2.5)
Article Abstract:
A new positively-doped two-chain ladder compound, La(sub 1-x)Sr(sub x)CuO(sub 2.5) synthesized at high pressures shows a substantial insulator to metal transition, which is directly proportional to the rate of doping. Ladder compounds are rare superconductors showing high-temperature superconductivity in real materials. Doping dependence of magnetic susceptibility on the temperature is discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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A 'checkerboard' electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2
Article Abstract:
Low-temperature electronic structure imaging studies of a lightly hole-doped copper oxide Ca2-xNaxCuO2Cl2 or Na-CCOC is presented. It is seen that an indeterminate relationship exists between checkerboard electronic crystal state in Na-CCOC and the novel electronic phases proposed for copper oxides.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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