Layered cuprates

P. A. Salvador, K. Otzschi, H. Zhang, J. R. Mawdsley, K. B. Greenwood, B. M. Dabrowski, L. D. Marks, Thomas O Mason, Kenneth R Poeppelmeier

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Layered copper-oxide superconductors exhibit the highest critical transition temperatures of any materials. Yet all of the known double perovskites A′A″B′B″O6 containing copper have a random or rock salt distribution of the B cations with the exception of the unique layered arrangement found in La2CuSnO6. Only the layered arrangement contains the CuO22- planes which are necessary for high-temperature superconductivity. The occurrence of layered or two dimensional structures increases markedly when vacancies are introduced on the oxygen sublattice, as evidenced in Ln2AEmCu2TimO5+3m (Ln = lanthanide, Y: AE = Ba, Ca: 2≤m≤4). Similarities among oxygen-deficient structures, especially those with two-dimensional solid-state features, are discussed. Combined conductivity and thermopower analysis are presented to elucidate their unique internal chemistry, defect structure, and conduction parameters. In particular, data for La2-xSrxCuSnO6 are presented and related to the crystal chemistry of the copper-oxygen layer. These data are compared with La2Ba2Cu2Sn2O11 and La2Ba2Cu2Ti2O11 to illustrate the significance of oxygen vacancies on the properties of the copper oxygen planes. New layered cuprates are discussed including the mixed A-site stoichiometries Ln′Ln″AEmCu2TimO5+3m (Ln = lanthanide, Y: AE = Ba, Ca: 2≤m≤4) which contain the smaller lanthanide (Ln″) ordered between the closely spaced, facing sheets of Cu-O square pyramids.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages311-322
Number of pages12
Volume453
Publication statusPublished - 1997
EventProceedings of the 1996 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 2 1996Dec 5 1996

Other

OtherProceedings of the 1996 MRS Fall Symposium
CityBoston, MA, USA
Period12/2/9612/5/96

Fingerprint

Lanthanoid Series Elements
Rare earth elements
Oxygen
Copper
Crystal chemistry
Oxide superconductors
Copper oxides
Defect structures
Thermoelectric power
Oxygen vacancies
Superconductivity
Stoichiometry
Superconducting transition temperature
Vacancies
Cations
Salts
Positive ions
Rocks

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Salvador, P. A., Otzschi, K., Zhang, H., Mawdsley, J. R., Greenwood, K. B., Dabrowski, B. M., ... Poeppelmeier, K. R. (1997). Layered cuprates. In Materials Research Society Symposium - Proceedings (Vol. 453, pp. 311-322). Materials Research Society.

Layered cuprates. / Salvador, P. A.; Otzschi, K.; Zhang, H.; Mawdsley, J. R.; Greenwood, K. B.; Dabrowski, B. M.; Marks, L. D.; Mason, Thomas O; Poeppelmeier, Kenneth R.

Materials Research Society Symposium - Proceedings. Vol. 453 Materials Research Society, 1997. p. 311-322.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Salvador, PA, Otzschi, K, Zhang, H, Mawdsley, JR, Greenwood, KB, Dabrowski, BM, Marks, LD, Mason, TO & Poeppelmeier, KR 1997, Layered cuprates. in Materials Research Society Symposium - Proceedings. vol. 453, Materials Research Society, pp. 311-322, Proceedings of the 1996 MRS Fall Symposium, Boston, MA, USA, 12/2/96.
Salvador PA, Otzschi K, Zhang H, Mawdsley JR, Greenwood KB, Dabrowski BM et al. Layered cuprates. In Materials Research Society Symposium - Proceedings. Vol. 453. Materials Research Society. 1997. p. 311-322
Salvador, P. A. ; Otzschi, K. ; Zhang, H. ; Mawdsley, J. R. ; Greenwood, K. B. ; Dabrowski, B. M. ; Marks, L. D. ; Mason, Thomas O ; Poeppelmeier, Kenneth R. / Layered cuprates. Materials Research Society Symposium - Proceedings. Vol. 453 Materials Research Society, 1997. pp. 311-322
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N2 - Layered copper-oxide superconductors exhibit the highest critical transition temperatures of any materials. Yet all of the known double perovskites A′A″B′B″O6 containing copper have a random or rock salt distribution of the B cations with the exception of the unique layered arrangement found in La2CuSnO6. Only the layered arrangement contains the CuO22- planes which are necessary for high-temperature superconductivity. The occurrence of layered or two dimensional structures increases markedly when vacancies are introduced on the oxygen sublattice, as evidenced in Ln2AEmCu2TimO5+3m (Ln = lanthanide, Y: AE = Ba, Ca: 2≤m≤4). Similarities among oxygen-deficient structures, especially those with two-dimensional solid-state features, are discussed. Combined conductivity and thermopower analysis are presented to elucidate their unique internal chemistry, defect structure, and conduction parameters. In particular, data for La2-xSrxCuSnO6 are presented and related to the crystal chemistry of the copper-oxygen layer. These data are compared with La2Ba2Cu2Sn2O11 and La2Ba2Cu2Ti2O11 to illustrate the significance of oxygen vacancies on the properties of the copper oxygen planes. New layered cuprates are discussed including the mixed A-site stoichiometries Ln′Ln″AEmCu2TimO5+3m (Ln = lanthanide, Y: AE = Ba, Ca: 2≤m≤4) which contain the smaller lanthanide (Ln″) ordered between the closely spaced, facing sheets of Cu-O square pyramids.

AB - Layered copper-oxide superconductors exhibit the highest critical transition temperatures of any materials. Yet all of the known double perovskites A′A″B′B″O6 containing copper have a random or rock salt distribution of the B cations with the exception of the unique layered arrangement found in La2CuSnO6. Only the layered arrangement contains the CuO22- planes which are necessary for high-temperature superconductivity. The occurrence of layered or two dimensional structures increases markedly when vacancies are introduced on the oxygen sublattice, as evidenced in Ln2AEmCu2TimO5+3m (Ln = lanthanide, Y: AE = Ba, Ca: 2≤m≤4). Similarities among oxygen-deficient structures, especially those with two-dimensional solid-state features, are discussed. Combined conductivity and thermopower analysis are presented to elucidate their unique internal chemistry, defect structure, and conduction parameters. In particular, data for La2-xSrxCuSnO6 are presented and related to the crystal chemistry of the copper-oxygen layer. These data are compared with La2Ba2Cu2Sn2O11 and La2Ba2Cu2Ti2O11 to illustrate the significance of oxygen vacancies on the properties of the copper oxygen planes. New layered cuprates are discussed including the mixed A-site stoichiometries Ln′Ln″AEmCu2TimO5+3m (Ln = lanthanide, Y: AE = Ba, Ca: 2≤m≤4) which contain the smaller lanthanide (Ln″) ordered between the closely spaced, facing sheets of Cu-O square pyramids.

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