Phase Competition and Anomalous Thermal Evolution in High-Temperature Superconductors

Abstract

The interplay of competing orders is relevant to high-temperature superconductivity known to emerge upon suppression of a parent antiferromagnetic order typically via charge doping. How such interplay evolves at low temperature---in particular at what doping level the zero-temperature quantum critical point (QCP) is located---is still elusive because it is masked by the superconducting state. The QCP had long been believed to follow a smooth extrapolation of the characteristic temperature $T^{\ast }$ for the strange normal state well above the superconducting transition temperature. However, recently the $T^{\ast }$ within the superconducting dome was reported to unexpectedly exhibit back-bending likely in the cuprate Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$. Here we show that the original and revised phase diagrams can be understood in terms of weak and moderate competitions, respectively, between superconductivity and a pseudogap state such as $d$-density-wave or spin-density-wave, based on both Ginzburg-Landau theory and the realistic $t$-$t^{\prime }$-$t^{\prime \prime }$-$J$-$V$ model for the cuprates. We further found that the calculated temperature and doping-level dependence of the quasiparticle spectral gap and Raman response qualitatively agrees with the experiments. In particular, the $T^{\ast }$ back-bending can provide a simple explanation of the observed anomalous two-step thermal evolution dominated by the superconducting gap and the pseudogap, respectively. Our results imply that the revised phase diagram is likely to take place in high-temperature superconductors.

13 pages, 12 figures

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