Pressure dependence of the oxygen isotope effect in YBa${}_2$Cu${}_4$O${}_8$

Abstract

We have carried out measurements of the pressure dependence to 1.2 GPa of the oxygen isotope effect on $T_c$ in the high-$T_c$ superconductor YBa${}_2$Cu${}_4$O${}_8$ using a clamp cell in a SQUID magnetometer. This compound lies close to, but just above, the 1/8${}^{th}$ doping point where in La${}_{2-x}$Sr${}_x$CuO${}_4$ marked anomalies in isotope effects occur. Both isotopes show the same very large pressure dependence of $T_c$ with the result that the isotope exponent remains low ($\sim$0.08) but increases slightly with increasing pressure. This is discussed in terms of stripe suppression, a competing pseudogap and the effect of superconducting fluctuations.

4 pages, 1 figures, submitted to Phys. Rev. B

References in corpus (4)

• Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2O8+d
• Distinct doping dependences of the pseudogap and superconducting gap La${}_{2-x}$Sr${}_x$CuO${}_4$ cuprate superconductors
• Cuprate Fermi orbits and Fermi arcs: the effect of short-range antiferromagnetic order
• Thermodynamic properties of Pb determined from pressure-dependent critical-field measurements