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.

arXiv comment4 pages, 1 figures, submitted to Phys. Rev. B

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