Locating the pseudogap closing point in cuprate superconductors: absence of entrant or reentrant behavior

Abstract

Current descriptions of the pseudogap in underdoped cuprates envision a doping-dependent transition line $T^{\ast }(p)$ which descends monotonically towards zero just beyond optimal doping. There is much debate as to the location of the terminal point $p^{\ast }$ where $T^{\ast }(p)$ vanishes, whether or not there is a phase transition at $T^{\ast }$ and exactly how $T^{\ast }(p)$ behaves below $T_c$ within the superconducting dome. One perspective sees $T^{\ast }(p)$ cutting the dome and continuing to descend monotonically to zero at $p_{crit}\approx 0.19$ holes/Cu $-$ referred to here as `entrant behavior'. Another perspective derived from photoemission studies is that $T^{\ast }(p)$ intersects the dome near $p_{crit}\approx 0.23$ holes/Cu then turns back below $T_c$, falling to zero again around $p_{crit}\approx 0.19$ $-$ referred to here as `reentrant behavior'. By examining thermodynamic data for Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ we show that neither entrant nor reentrant behavior is experimentally supported. Rather, $p_{crit}\approx 0.19$ sharply delimits the pseudogap regime and for $p<0.19$ the pseudogap is always present, independent of temperature. Similar results are found for Y${}_{0.8}$Ca${}_{0.2}$Ba${}_2$Cu${}_3$O${}_{7-\delta }$. For both materials $T^{\ast }(p)$ is not a temperature but a crossover scale, $\approx E^{\ast }(p)/2k_B$, reflecting instead the underlying pseudogap energy $E^{\ast }(p)$ which vanishes as $p\to 0.19$.

20 Pages, 9 Figures, in press Phys. Rev. B

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Cited by in corpus (13)

• Incoherent transport across the strange metal regime of highly overdoped cuprates
• Charge density waves and Fermi-surface reconstruction in the clean overdoped cuprate superconductor Tl2Ba2CuO6+x
• Resistivity phase diagram of cuprates revisited
• Fate of charge order in overdoped La-based cuprates
• Field-dependent specific heat of the canonical underdoped cuprate superconductor YBa${}_2$Cu${}_4$O${}_8$
• Unified intermediate coupling description of the pseudogap and the strange metal phases of cuprates
• Revised phase diagram of the high-$T_c$ cuprate superconductor Pb-doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ revealed by anisotropic transport measurements
• Muon Spin Relaxation and fluctuating magnetism in the pseudogap phase of YBa${}_2$Cu${}_3$O${}_y$
• Carrier density crossover and quasiparticle mass enhancement in a doped 5$d$ Mott insulator
• Pseudogap Suppression by Competition with Superconductivity in La-Based Cuprates
• Bilocal quantum criticality
• Doping Dependence of Upper Critical Field of High-Tc Cuprate Bi2+xSr2-xCaCu2O8+d Estimated from Irreversibility Field at Zero Temperature
• Strange metal in the doped Hubbard model via percolation