The cuprate phase diagram and the influence of nanoscale inhomogeneities

Abstract

The phase diagram associated with the high Tc superconductors is complicated by an array of different ground states. The parent material represents an antiferromagnetic insulator but with doping superconductivity becomes possible with transition temperatures previously thought unattainable. The underdoped region of the phase diagram is dominated by the so-called pseudogap phenomena whereby in the normal state the system mimics superconductivity in its spectra response but does not show the complete loss of resistivity associated with the superconducting state. An understanding of this regime presents one of the great challenges for the field. In the present study we revisit the structure of the phase diagram as determined in photoemission studies. By careful analysis of the role of nanoscale inhomogeneities in the overdoped region we are able to more carefully separate out the gaps due to the pseudogap phenomena from the gaps due to the superconducting transition. Within a mean field description we are thus able to link the magnitude of the gap directly to the Heisenberg exchange interaction term, $J\sum s_i\cdot s_j$, contained in the $t-J$ model. This approach provides a clear indication that the pseudogap is that associated with spin singlet formation.

arXiv commentrevised to include supplementary section and correct references in Fig. 5

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• Cuprate superconductors as viewed through a striped lens
• Emergence of superconductivity in the cuprates via a universal percolation process
• Anomalies in the pseudogap phase of the cuprates: Competing ground states and the role of umklapp scattering
• Locating the pseudogap closing point in cuprate superconductors: absence of entrant or reentrant behavior
• Umklapp scattering as the origin of $T$-linear resistivity in the normal state of high-$T_c$ cuprate superconductors
• Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates
• Continuous doping of a cuprate surface: new insights from in-situ ARPES
• Three interaction energy scales in single-layer high-T${}_C$ cuprate HgBa${}_2$CuO${}_{4+\delta }$
• On the dilemma between percolation processes and fluctuating pairs as the origin of the enhanced conductivity above the superconducting transition in cuprates
• Empirical case for two pseudogaps in cuprate superconductors