Density of state and non-magnetic impurity effects in electron-doped cuprates - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: We analyze the density of state DOS and a non-magnetic impurity effect inelectron-doped cuprates starting from two different scenarios: the$d {x^{2}-y^{2}}$-wave superconductivity coexisting with antiferromagnetic spindensity wave SDW order versus $d {x^{2}-y^{2}}$-wave superconductivity with ahigher harmonic. We find that in both cases the local density of state LDOSexhibits two impurity-induced resonance states at low energies. We also findthat for the intermediate value of the SDW gap, the DOS looks similar to thatobtained from the scenario of the $d {x^{2}-y^{2}}$-wave gap with a higherharmonic, suggesting the presence of a non-monotonic $d {x^{2}-y^{2}}$-wavegap. However, if the SDW gap is sufficiently large the DOS looks moreconventional s-wave like. This obvious difference from the DOS resulted fromthe $d {x^{2}-y^{2}}$-wave gap with a higher harmonic model, coulddifferentiate the two above scenarios and is needed to be proved in the furtherdoping dependence of tunneling spectrum measurement.



Autor: Bin Liu, Ying Liang

Fuente: https://arxiv.org/







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