Inverse correlation between quasiparticle mass and Tc in a cuprate high-Tc superconductor

Abstract

Close to a zero temperature transition between ordered and disordered electronic phases, quantum fluctuations can lead to a strong enhancement of the electron mass and to the emergence of competing phases such as superconductivity. A correlation between the existence of such a quantum phase transition and superconductivity is quite well established in some heavy fermion and iron-based superconductors and there have been suggestions that high temperature superconductivity in the copper oxide materials (cuprates) may also be driven by the same mechanism. Close to optimal doping, where the superconducting transition temperature $T_c$ is maximum in the cuprates, two different phases are known to compete with superconductivity: a poorly understood pseudogap phase and a charge ordered phase. Recent experiments have shown a strong increase in quasiparticle mass $m^{\ast }$ in the cuprate YBa${}_2$Cu${}_3$O${}_{7-\delta }$ as optimal doping is approached suggesting that quantum fluctuations of the charge ordered phase may be responsible for the high-$T_c$ superconductivity. We have tested the robustness of this correlation between $m^{\ast }$ and $T_c$ by performing quantum oscillation studies on the stoichiometric compound YBa${}_2$Cu${}_4$O${}_8$ under hydrostatic pressure. In contrast to the results for YBa${}_2$Cu${}_3$O${}_{7-\delta }$, we find that in YBa${}_2$Cu${}_4$O${}_8$ the mass decreases as $T_c$ increases under pressure. This inverse correlation between $m^{\ast }$ and $T_c$ suggests that quantum fluctuations of the charge order enhance $m^{\ast }$ but do not enhance $T_c$.

arXiv comment11 pages includes supplementary information

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Cited by in corpus (9)

• Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
• A Tale of Two Metals: contrasting criticalities in the pnictides and hole-doped cuprates
• Fermi liquid behavior of the in-plane resistivity in the pseudogap state of YBa_2Cu_4O_8
• Rapid Suppression of the Charge Density Wave in YBa${}_2$Cu${}_3$O${}_{6.6}$ under Hydrostatic Pressure
• Two types of superconducting domes in unconventional superconductors
• Quantum spin fluctuations and evolution of electronic structure in cuprates
• NMR study of charge density waves under hydrostatic pressure in YBa2Cu3Oy
• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
• Inelastic X-ray scattering studies of phonon dispersions in superconductors at high pressures