TY - JOUR

T1 - Simulating superconducting properties of overdoped cuprates

T2 - The role of inhomogeneity

AU - Pal, Mainak

AU - Kreisel, Andreas

AU - Atkinson, W. A.

AU - Hirschfeld, P. J.

PY - 2023/4/4

Y1 - 2023/4/4

N2 - Theoretical studies of disordered d-wave superconductors have focused, with a few exceptions, on optimally doped models with strong scatterers. Addressing recent controversies about the nature of the overdoped cuprates, however, requires studies of the weaker scattering associated with dopant atoms. Here we study simple models of such systems in the self-consistent Bogoliubov-de Gennes (BdG) framework, and compare to disorder-averaged results using the self-consistent T-matrix-approximation (SCTMA). Despite surprisingly linear in energy be-havior of the low-energy density of states even for quite disordered systems, the superfluid density in such cases retains a quadratic low-temperature variation of the penetration depth, unlike other BdG results reported recently. We trace the discrepancy to smaller effective system size employed in that work. Overall, the SCTMA performs remarkably well, with the exception of highly disordered systems with strongly suppressed superfluid density. We explore this interesting region where gap inhomogeneity dominates measured superconducting properties, and compare with overdoped cuprates.

AB - Theoretical studies of disordered d-wave superconductors have focused, with a few exceptions, on optimally doped models with strong scatterers. Addressing recent controversies about the nature of the overdoped cuprates, however, requires studies of the weaker scattering associated with dopant atoms. Here we study simple models of such systems in the self-consistent Bogoliubov-de Gennes (BdG) framework, and compare to disorder-averaged results using the self-consistent T-matrix-approximation (SCTMA). Despite surprisingly linear in energy be-havior of the low-energy density of states even for quite disordered systems, the superfluid density in such cases retains a quadratic low-temperature variation of the penetration depth, unlike other BdG results reported recently. We trace the discrepancy to smaller effective system size employed in that work. Overall, the SCTMA performs remarkably well, with the exception of highly disordered systems with strongly suppressed superfluid density. We explore this interesting region where gap inhomogeneity dominates measured superconducting properties, and compare with overdoped cuprates.

KW - PENETRATION DEPTH

KW - TEMPERATURE-DEPENDENCE

KW - WAVE

KW - YBA2CU3O6.95

U2 - 10.1103/PhysRevB.107.144501

DO - 10.1103/PhysRevB.107.144501

M3 - Journal article

VL - 107

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 14

M1 - 144501

ER -