“High-pressure measurements on single crystals of electron-doped cuprate superconductor Pr2-xCexCuO4,” by Costel R. Rotundu (UC Berkeley) in Knudsen 6-129

Date: 
Friday, March 15, 2013 - 2:30pm
Series: 
Condensed Matter Physics Seminar

 

I present high-pressure diamond-anvil cell (DAC) synchrotron x-ray, resistivity, and ac-susceptibility measurements on the electron-doped cuprate superconductor Pr2-xCexCuO4 to much higher pressures than previously reported under quasi-hydrostatic conditions of pressure by using Ne gas as pressure transmitting media. At 2.72 GPa between 88 and 98% of the superconducting T' phase of the optimally doped Pr1.85Ce0.15CuO4 transforms into the insulating phase T. With application of pressure, the T phase becomes more insulating, so we present here an example of electron doping in the T structure. The results have implications for the search for ambipolar high-Tc cuprate superconductors.

For the DAC resistivity measurements we developed a method to "wire" and attach the sample using focused ion beam ultrathin lithography. This method shows promise for measurements at multi-Mbar pressures