Theoretical understanding of correlation between magnetic phase transition and the superconducting dome in highTc cuprates
Abstract
Many issues concerning the origin of hightemperature superconductivity (HTS) are still under debate. For example, how the magnetic ordering varies with doping and its relationship with the superconducting temperature; and why the maximal Tc always occurs near the quantum critical point. In this paper, taking holedoped La2CuO4 as a classical example, we employ the firstprinciples band structure and total energy calculations and Monte Carlo simulations to explore how the symmetrybreaking magnetic ground state evolves with hole doping and the origin of a domeshaped superconductivity region in the phase diagram. We demonstrate that the local antiferromagnetic ordering and doping play key roles in determining the electronphonon coupling, thus Tc. Initially, the La2CuO4 possesses a checkerboard local antiferromagnetic ground state. As the hole doping increases, Tc increases with the increase of the density of states at the Fermi surface. But as the doping increases further, the strength of the antiferromagnetic interaction weakens. At the critical doping level, a magnetic phase transition occurs that reduces the local antiferromagnetismassisted electronphonon coupling, thus diminishing the Tc. The superconductivity disappears in the heavily overdoped region when the antiferromagnetic ordering disappears. These observations could account for why cuprates have a domeshaped superconductivity region in the phase diagram. Our study, thus, contributes to a fundamental understanding of the correlation between doping, local magnetic ordering, and superconductivity of HTS.
 Publication:

arXiv eprints
 Pub Date:
 March 2023
 DOI:
 10.48550/arXiv.2303.15018
 arXiv:
 arXiv:2303.15018
 Bibcode:
 2023arXiv230315018Z
 Keywords:

 Condensed Matter  Superconductivity
 EPrint:
 14 pages, 3 figures in the main text