Structure-compressibility relationships in layered cuprate materials

Neil C. Hyatt, Joseph A. Hriljac, Yuzuru Miyazaki, Ian Gameson, Peter P. Edwards, Andrew P. Jephcoat

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

High-resolution synchrotron x-ray powder-diffraction experiments have been undertaken on the related series of layered cuprates of chemical formula HgBa2CuO4+δ, Hg0.8Cr0.2Ba2CuO4+δ, Sr2CuO2CO3, NbSr2EuCu2O8, GaSr2YCu2O7, and Pb2Sr2YCu3O8+δ to applied pressures of 6.05, 7.64, 5.56, 4.47, 6.00, and 6.03 GPa, respectively. No discernible structural phase transitions were observed over these pressure ranges. The data have been analyzed using the Murnaghan formula to derive compressibilities and bulk moduli. The ambient pressure bulk moduli for the various cuprates are 63(2), 64(2), 62(2), 120(4), 85(3), and 129(4) GPa, respectively. In all cases the compressibility is the highest in the direction perpendicular to the cuprate layers (out-of-plane) and very anisotropic, with ratios for the out-of-plane to the in-plane compressibilities of 1.38, 1.25, 1.97, 1.45, 1.37 and 3.31, respectively. These variations are discussed in light of the crystal chemistry of these systems, and the observed trends should be helpful in tailoring the response of layered cuprates to applied hydrostatic pressure.

Original languageEnglish
Article number014507
Pages (from-to)145071-1450713
Number of pages1305643
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number1
DOIs
Publication statusPublished - Jan 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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