High-pressure spin shifts in the pseudogap regime of superconducting YBa2Cu4O8 as revealed by 17O NMR

Abstract

A new NMR anvil cell design is used for measuring the influence of high pressure on the electronic properties of the high-temperature superconductor YBa${}_2$Cu${}_4$O${}_8$ above the superconducting transition temperature $T_{\mathrm{c}}$. It is found that pressure increases the spin shift at all temperatures in such a way that the pseudo-gap feature has almost disappeared at 63 kbar. This change of the temperature dependent spin susceptibility can be explained by a pressure induced proportional decrease (factor of two) of a temperature dependent component, and an increase (factor of 9) of a temperature independent component, contrary to the effects of increasing doping. The results demonstrate that one can use anvil cell NMR to investigate the tuning of the electronic properties of correlated electronic materials with pressure.

arXiv comment4 pages, 4 figures, accepted for publication in Phys. Rev. B

References in corpus (3)

• Planar Cu and O hole densities in high-Tc cuprates determined with NMR
• Pressure-induced lattice instabilities and superconductivity in YBa2Cu4O8 and optimally doped YBa2Cu3O7-δ
• Evidence for two electronic components in high-temperature superconductivity from NMR

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