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Remarkable transition from rocksalt/perovskite layered structure to fluorite/rocksalt layered structure in rapidly cooled Ln2CuO4

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Chami Nilasha Kahakachchi Patabendige, Abul Kalam Azad, Paul Alexander Connor, Aurélie Rolle, John Thomas Sirr Irvine

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Abstract

Lanthanide cuprates of formula Ln2CuO4 exist in two principal forms, T and T′ which are renowned for their exhibition at low temperatures of hole and electronic types of superconductivity, respectively. These structures differ primarily in the arrangement of oxygen between the perovskite layers and also in nature of the copper oxygen planes. The Cu-O distance in the T structure (~1.90 Å) is much shorter than the T′ (1.97Å), reflecting a transition between partial Cu+ and partial Cu3+ character. In seeking to find compositions that bridge these two structure/electron carrier types, we observed the transition from a T structure to a T′ type structure, resulting in the metastable form T″ with slightly larger volume but similar character to T′. This transition from T to T″ is associated with 5% increase in a and a 5% decrease in c parameters of the tetragonal unit cells, which results in disintegration of ceramic bodies.

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Original languageEnglish
Article number1504
Number of pages5
JournalScientific Reports
Volume3
DOIs
Publication statusPublished - 21 Mar 2013

    Research areas

  • ZIRCONIA, SUPERCONDUCTIVITY, CU-O SYSTEM, PHASE, COPPER OXIDES, OXYGEN, CRYSTAL-CHEMISTRY, COMPOUND

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