High pressure study on Pr$_{1.85}$Ce$_{0.15}$CuO$_{4-\delta }$ single crystals

ORAL

Abstract

Transport measurements to 2.5 GPa on electron-doped cuprates revealed modest changes in physical properties, if any [1]. Room temperature synchrotron diffraction on powder samples show that the non-superconducting parent Pr$_{2}$CuO$_{4}$ exhibits a gradual structural transition from T' to T phase when subject to pressures greater than 15 GPa [2]. Pr$_{2-x}$Ce$_{x}$CuO$_{4}$ (PCCO) is superconducting for a Ce doping range 0.12 -- 0.2 (T' structure). Both pressure and Ce doping have the same shrinkage effect on the lattice constants. Here, we report high pressure ac susceptibility, resistivity and Raman shift data on x = 0.15 single crystals to 30 GPa. References: [1] C. Murayama \textit{et al.}, Nature, \textbf{339}, 293 (1989) [2] H. Wilhelm \textit{et al.}, Science and Technology of High Pressure, Proceedings of AIRAPT-17, pp. 740-743, Universities Press, Hyderabad, India (2000)

*The authors acknowledge the support from the State of Maryland and NSF through DMR-0653535 (CRR and RLG), DOE through DE-FG02-02ER45955 (VVS) and Carnegie Canada (AG).

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Authors

  • Costel R. Rotundu

    • Department of Physics, University of Maryland, College Park, MD 20742, USA

  • Viktor V. Struzhkin

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA

  • Alexander Goncharov

    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA

  • Richard L. Greene

    • Department of Physics, University of Maryland, College Park, MD 20742, USA