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arXiv 0812.0951cond-mat.supr-con
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铜氧化物三维Phase Diagrams中的失配应变临界点

The Misfit Strain Critical Point in the 3D Phase Diagrams of Cuprates

Nicola Poccia, Michela Fratini

摘要:

在撰写本文时,已经报道了数百种不同的铜酸盐材料的数据,其中相当一部分在高达130 K的温度下显示出超导性。几个具有可比能量的竞争相的存在在不同的材料中以不同的方式表现出来,因此不可能收敛到一个高Tc超导性的通用理论。为了找到一个统一的描述,提出了铜酸盐的Aeppli-Bianconi三维相图,其中超晶格失配应变(eta)是掺杂(delta)和温度T之外的第三个变量。描述了磁序和超导序的3D相图。我们提出了一个能描述Tc(delta,eta)表面的公式,它允许识别在(delta)c=1/8和(eta)c = 7%处的条纹量子临界点,该临界点与由失配应变控制的无公度到公度条纹的相变有关。

英文摘要:

At the time of writing, data have been reported on several hundred different cuprates materials, of which a substantial fraction show superconductivity at temperatures as high as 130 K. The existence of several competing phases with comparable energy shows up in different ways in different materials, therefore it has not been possible to converge toward a universal theory for high Tc superconductivity. With the aim to find a unified description the Aeppli-Bianconi 3D phase diagram of cuprates has been proposed where the superlattice misfit strain (eta) is the third variable beyond doping (delta) and temperature T. The 3D phase diagrams for the magnetic order, and for the superconducting order extended to all cuprates families are described. We propose a formula able to describe the Tc (delta,eta) surface, this permits to identify the stripe quantum critical point at (delta)c=1/8 and (eta)c =7percent which is associated with the incommensurate to commensurate stripe phase transition, controlled by the misfit strain.

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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