Effect of impurities on incommensurate spin fluctuations in a d-wave superconductor
De-Cai Zhang, Jian-Xin Li
DOI 10.1103/PhysRevB.80.174523 · Physical Review B
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Abstract
The effects of nonmagnetic impurity on the spin response in a dx2−y2-wave superconductor are studied theoretically. Starting from the dispersion derived from the mean-field t−t′−J model, we carry out the calculations based on the self-consistent t-matrix approximation and the random phase approximation. The effect of impurity is treated both via the self-energy correction and the vertex correction. It is found that the incommensurate (IC) spin fluctuations at frequencies above the spin gap are enhanced notably and the incommensurability is reduced, when impurities are introduced. These effects are less prominent with the increase in dopings. For low frequencies in the spin gap the IC spin fluctuations is enhanced with no reduction in incommensurability. The vertex corrections within the ladder approximation do not significantly modify the renormalized-bubble result, but it induces additional excitations in the spin gap. These results are qualitatively consistent with experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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