TRANSPORT-PROPERTIES OF LN2-XCEXCUO4-Y SINGLE-CRYSTALS UNDER HIGH-PRESSURE

The transport properties of the electron-doped cuprates Ln2-xCexCuO4 ( Ln=Pr, Nd and Sm) single crystals are investigated under hydrostatic p ressure up to 2 GPa. The effects of pressure on both the c-axis (rho(c )) and the in-plane (rho(ab)) resistivity are measured from room tempe rature down to the superconducting state. It is found that at 300 K, d ln rho(ab)/dP almost-equal-to dln rho(c)/dP almost-equal-to -3% GPa-1. The pressure does not change the temperature dependence of the normal state resistivity, which at high temperature in both directions follo ws a rho approximately A(P)T2 law, but the coefficient A(P) decreases as pressure is increased. Moreover, we have found that for any lanthan ide host (Pr, Sm and Nd) the onset of superconductivity does not chang e with pressure (P < 2 GPa).