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arXiv 0709.4527cond-mat.supr-concond-mat.str-el
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电子掺杂高T_c超导体中的杂质共振态

Impurity resonance states in electron-doped high T_c superconductors

Yuan Wan, Hai-Dong Lv, Hong-Yan Lu, Qiang-Hua Wang

摘要:

两种情况,即,已经引入了各向异性s波配对(s波方案)和与反铁磁性共存的d波配对(共存方案)来理解电子掺杂的铜氧化物中的一些看似s波的行为。我们认为,在共存的情况下的电子结构中的杂质的存在下。我们发现,即使AF顺序打开一个完整的准粒子激发光谱的间隙,中间的间隙共振峰的局域态密度(LDOS)周围的杂质仍然可以观察到的d波配对间隙的存在下。杂质态在共存相中的特征明显不同于纯AF或纯d波配对相,显示了共存AF和d波配对序的独特作用。另一方面,已知在纯s波情况下,没有中间带隙态可以由掺杂杂质诱导。因此,我们提出对非磁性杂质的响应可以用来区分这两种情况。

英文摘要:

Two scenarios, i.e., the anisotropic s-wave pairing (the s-wave scenario) and the d-wave pairing coexisting with antiferromagnetism (the coexisting scenario) have been introduced to understand some of seemingly s-wave like behaviors in electron doped cuprates. We considered the electronic structure in the presence of a nonmagnetic impurity in the coexistence scenario. We found that even if the AF order opens a full gap in quasi-particle excitation spectra, the mid-gap resonant peaks in local density of states (LDoS) around an impurity can still be observed in the presence of a d-wave pairing gap. The features of the impurity states in the coexisting phase are markedly different from the pure AF or pure d-wave pairing phases, showing the unique role of the coexisting AF and d-wave pairing orders. On the other hand, it is known that in the pure s-wave case no mid-gap states can be induced by a nonmagnetic impurity. Therefore we proposed that the response to a nonmagnetic impurity can be used to differentiate the two scenarios.

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