2024/12/19 by Dai-Wei Qu, Qiaoyi Li, Shou-Shu Gong +3 · 1 voice · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism
paper · doi:10.1103/physrevlett.133.256003
openalex publication_date 2024/12/19 · openalex created_date 2024/12/20 · openalex updated_date 2026/07/30
Recently, robust d-wave superconductive (SC) order has been unveiled in the ground state of the 2D t-t'-J model-with both nearest-neighbor (t) and next-nearest-neighbor (t') hoppings-by density matrix renormalization group studies. However, there is currently a debate on whether the d-wave SC holds up strong on both t'/t>0 and t'/t<0 cases for the t-t'-J model, which correspond to the electron- and hole-doped sides of the cuprate phase diagram, respectively. Here, we exploit state-of-the-art thermal tensor network approach to accurately obtain the phase diagram of the t-t'-J model on cylinders with widths up to W=6 and down to low temperature as T/J≃0.06, pushing the boundaries of contemporary finite-T calculations. For t'/t>0, we find a domelike SC regime with a diverging d-wave pairing susceptibility, χSC∝1/Tα below a characteristic temperature Tc*. Near optimal doping, Tc* reaches its highest value of about 0.15J. Above Tc* yet below a higher crossover temperature T*, the magnetic susceptibility becomes suppressed, which can be related to the onset of pseudogap (PG) behaviors. On the other hand, for t'/t<0, we find the pairing correlations are much weaker, although there exhibits a node-antinode structure in the PG regime as observed in the hole-doped cuprates. The thermal tensor network calculations of the t-t'-J model underscore both the similarities and differences in the finite-temperature phase diagram between the fundamental model and cuprates, yielding unique insights into their intricate behaviors.