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arXiv 1504.04500cond-mat.supr-con
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对-对相互作用作为高温$_c$超导机制

Pair-pair interactions as a mechanism for high-T$_c$ superconductivity

William Sacks, Alain Mauger, Yves Noat

摘要:

库珀对之间的相互作用被认为是超导态的一种机制。高于$T_c$,预先存在但波动的库珀对产生非常规的{ \it赝隙}(PG)状态,其特征在于通过实验。在临界温度,对-对相互作用引起这些预形成的对的类玻色凝聚,导致超导(SC)状态。在$T_c$以下,凝聚能和对-对相互作用$β$都与凝聚密度$N_{oc}(T)$成正比,而通常的费米能级谱隙$Δ_p$与温度无关。新的序参量$β(T)$可以作为温度、载流子浓度和无序度的函数,即相图。铜氧化物的复杂性,揭示了大量的参数,是一个后果的{ \it耦合准粒子的库珀对激发}。后一种解释得到了观测到的准粒子谱函数的有力支持。

英文摘要:

The mutual interaction between Cooper pairs is proposed as a mechanism for the superconducting state. Above $T_c$, pre-existing but fluctuating Cooper pairs give rise to the unconventional {\it pseudogap} (PG) state, well-characterized by experiment. At the critical temperature, the pair-pair interaction induces a Bose-like condensation of these preformed pairs leading to the superconducting (SC) state. Below $T_c$, both the condensation energy and the pair-pair interaction $β$ are proportional to the condensate density $N_{oc}(T)$, whereas the usual Fermi-level spectral gap $Δ_p$ is independent of temperature. The new order parameter $β(T)$, can be followed as a function of temperature, carrier concentration and disorder - i.e. the phase diagrams. The complexity of the cuprates, revealed by the large number of parameters, is a consequence of the {\it coupling of quasiparticles to Cooper-pair excitations}. The latter interpretation is strongly supported by the observed quasiparticle spectral function.

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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