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arXiv 0712.3307cond-mat.str-elcond-mat.supr-con
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电子掺杂铜氧化物的态密度和非磁性杂质效应

Density of state and non-magnetic impurity effects in electron-doped cuprates

Bin Liu, Ying Liang

摘要:

本文从两种不同的情况出发分析了电子掺杂铜氧化物的态密度和非磁性杂质效应:$d_{x^{2}-y^{2}}$波超导与反铁磁自旋密度波(SDW)序共存和$d_{x^{2}-y^{2}}$波超导与高次谐波共存。我们发现,在这两种情况下的局域态密度(LDOS)表现出两个杂质诱导的共振态态在低能量。我们还发现,对于SDW间隙的中间值,DOS看起来类似于从具有高次谐波的$d_{x^{2}-y^{2}}$ -波间隙的情况下获得的DOS,这表明存在非单调的$d_{x^{2}-y^{2}}$ -波间隙。然而,如果SDW间隙足够大,DOS看起来更像传统的s波。这种与DOS的明显差异是由具有高次谐波模型的$d_{x^{2}-y^{2}}$ -波隙引起的,可以区分上述两种情况,并且需要在隧道谱测量的进一步掺杂依赖性中证明。

英文摘要:

We analyze the density of state (DOS) and a non-magnetic impurity effect in electron-doped cuprates starting from two different scenarios: the $d_{x^{2}-y^{2}}$-wave superconductivity coexisting with antiferromagnetic spin density wave (SDW) order versus $d_{x^{2}-y^{2}}$-wave superconductivity with a higher harmonic. We find that in both cases the local density of state (LDOS) exhibits two impurity-induced resonance states at low energies. We also find that for the intermediate value of the SDW gap, the DOS looks similar to that obtained from the scenario of the $d_{x^{2}-y^{2}}$-wave gap with a higher harmonic, suggesting the presence of a non-monotonic $d_{x^{2}-y^{2}}$-wave gap. However, if the SDW gap is sufficiently large the DOS looks more conventional s-wave like. This obvious difference from the DOS resulted from the $d_{x^{2}-y^{2}}$-wave gap with a higher harmonic model, could differentiate the two above scenarios and is needed to be proved in the further doping dependence of tunneling spectrum measurement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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