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arXiv 0801.2546cond-mat.supr-concond-mat.str-el
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高温铜氧化物中的非单调赝能隙

Non-monotonic pseudo-gap in high-Tc cuprates

A. A. Kordyuk, S. V. Borisenko, V. B. Zabolotnyy, R. Schuster, D. S. Inosov, R. Follath, A. Varykhalov, L. Patthey, H. Berger

摘要:

高温超导的机制长期以来一直没有得到解决,这是因为人们对铜氧化物的正常状态还不了解。在这里,我们表明,正常状态的赝间隙表现出意想不到的非单调的温度依赖性,这排除了可能性来描述它由一个单一的机制,如超导相位波动。此外,这种行为,是非常相似的过渡金属dichalcogenides的电荷有序间隙的行为,完成了这两类化合物之间的对应关系:在PG状态的铜酸盐和dichalcogenides在不相称的电荷有序状态揭示了几乎相同的光谱的一个粒子激发的能量,动量和温度的函数。这些结果表明,正常态赝能隙,这被认为是非常独特的铜酸盐,似乎是一个普遍的复杂现象的二维金属。这不仅有助于阐明二维金属的正常态电子结构,而且还为二维固体的电子性质提供了新的见解,其中金属-绝缘体和金属-超导体转变分别被认为是基于粒子-空穴和粒子-粒子相互作用的不稳定性。

英文摘要:

The mechanism of high temperature superconductivity is not resolved for so long because the normal state of cuprates is not yet understood. Here we show that the normal state pseudo-gap exhibits an unexpected non-monotonic temperature dependence, which rules out the possibility to describe it by a single mechanism such as superconducting phase fluctuations. Moreover, this behaviour, being remarkably similar to the behaviour of the charge ordering gap in the transition-metal dichalcogenides, completes the correspondence between these two classes of compounds: the cuprates in the PG state and the dichalcogenides in the incommensurate charge ordering state reveal virtually identical spectra of one-particle excitations as function of energy, momentum and temperature. These results suggest that the normal state pseudo-gap, which was considered to be very peculiar to cuprates, seems to be a general complex phenomenon for 2D metals. This may not only help to clarify the normal state electronic structure of 2D metals but also provide new insight into electronic properties of 2D solids where the metal-insulator and metal-superconductor transitions are considered on similar basis as instabilities of particle-hole and particle-particle interaction, respectively.

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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