Sensitivity of $T_{\mathrm{c}}$ to pressure and magnetic field in the cuprate superconductor YBa${}_2$Cu${}_3$O${}_y$: evidence of charge order suppression by pressure

Abstract

Cuprate superconductors have a universal tendency to form charge density-wave (CDW) order which competes with superconductivity and is strongest at a doping $p\simeq 0.12$. Here we show that in the archetypal cuprate YBa${}_2$Cu${}_3$O${}_y$ (YBCO) pressure suppresses charge order, but does not affect the pseudogap phase. This is based on transport measurements under pressure, which reveal that the onset of the pseudogap at $T^{\ast }$ is independent of pressure, while the negative Hall effect, a clear signature of CDW order in YBCO, is suppressed by pressure. We also find that pressure and magnetic field shift the superconducting transition temperature $T_{\mathrm{c}}$ of YBCO in the same way as a function of doping - but in opposite directions - and most effectively at $p\simeq 0.12$. This shows that the competition between superconductivity and CDW order can be tuned in two ways, either by suppressing superconductivity with field or suppressing CDW order by pressure. Based on existing high-pressure data and our own work, we observe that when CDW order is fully suppressed at high pressure, the so-called "1/8 anomaly" in the superconducting dome vanishes, revealing a smooth $T_{\mathrm{c}}$ dome which now peaks at $p\simeq 0.13$. We propose that this $T_{\mathrm{c}}$ dome is shaped by the competing effects of the pseudogap phase below its critical point $p^{\star }\sim 0.19$ and spin order at low doping.

New Hall data added. 11 pages, 9 figures and 2 tables

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• Correlation between optical phonon softening and superconducting $T_c$ in YBa${}_2$Cu${}_3$O${}_x$ within $d$-wave Eliashberg theory
• Constrains on s and d components of electron boson coupling constants in one band d wave Eliashberg theory for high Tc superconductors
• Suppression of superconductivity by charge density wave order in YBa${}_2$Cu${}_3$O${}_{6.67}$
• Raman Response of the Charge Density Wave in Cuprate Superconductors
• Boosting superconductivity in ultrathin YBa${}_2$Cu${}_3$O${}_{7-\delta }$ films via nanofaceted substrates
• Taking a step back and looking at the superconducting dome from a distance
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress
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• Thermal decoupling in high-$T_c$ cuprate superconductors
• Evidence for antiferromagnetism coexisting with charge order in the trilayer cuprate HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Charge order in the Pr substituted YBa${}_2$Cu${}_3$O${}_7$ from high-field Hall effect measurements