High-pressure effects on single crystals electron-doped r$_{2-x}$Ce$_{x}$CuO$_{4}$

We present high pressure diamond anvil cell synchrotron X-ray, resistivity, and ac-susceptibility measurements on electron-doped cuprate Pr$_{2-x}$Ce$_{x}$CuO$_{4}$ to much higher pressures than previously reported. At 2.72 GPa between 88 and 98$$ of the superconducting T$^\prime$ phase \cite{Tprime} of the optimally doped Pr$_{1.85}$Ce$_{0.15}$CuO$_{4}$ transforms into the insulating phase T. The T$_{c}$ of the remaining 2-12$$ T$^\prime$ phase is suppressed continuously from 22 K to 18.5 K at about 14 GPa. Remarkably, the T$_{c}$ of the over doped Pr$_{1.83}$Ce$_{0.17}$CuO$_{4}$ remains practically unchanged even at 32 GPa. This behavior of the electron-doped cuprate contrasts with that of the hole-doped cuprate for which T$_{c}$ is first substantially enhanced with applied pressure.

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