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arXiv 1402.4014cond-mat.supr-con
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基于$^{17}$ O和$^{63}$ Cu NMR四极分裂的空穴掺杂铜酸盐的Phase diagram

Phase diagram of hole-doped cuprates based on $^{17}$O and $^{63}$Cu NMR quadrupole splittings

Damian Rybicki, Michael Jurkutat, Steven Reichardt, Jurgen Haase

摘要:

超导铜酸盐的相图通常用于显示它们的电子性质如何作为平均掺杂水平的函数而变化,即,CuO $_2$平面的平均空穴含量。在核磁共振(NMR)实验中,平均掺杂以及这些空穴在平面Cu和O之间的分布通过$^{63,65}$ Cu和$^{17}$ O NMR的四极分裂来揭示其本身。在这里,我们认为,所有公布的NMR数据的基础上,我们有利于一种新类型的相图,具有平面氧四极分裂,并与它的平面氧空穴含量作为横坐标,而不是平均空穴含量的CuO $_2$平面。在这样的图中,不同铜酸盐家族的超导圆顶根据其最大临界温度$T_{\rm c,max}$水平移动,该最大临界温度由母体材料的化学性质设定,这决定了其氧空穴含量。O空穴含量越高,通过实际掺杂可以实现的$T_{\rm c,max}$越高。这些发现也提供了一个策略,寻找具有较高的$T_{\rm c,max}$铜酸盐。

英文摘要:

The phase diagram of the superconducting cuprates is often used to show how their electronic properties change as a function of the mean doping level, i.e., the average hole content of the CuO$_2$ plane. In Nuclear Magnetic Resonance (NMR) experiments average doping, as well as the distribution of these holes between planar Cu and O reveals itself through the quadrupole splittings of the $^{63,65}$Cu and $^{17}$O NMR. Here we argue based on all published NMR data available to us in favor a new type of phase diagram that has the planar oxygen quadrupole splitting and with it the planar oxygen hole content as abscissa rather than the average hole content of the CuO$_2$ plane. In such a plot the superconducting domes of the different cuprate families are shifted horizontally according to their maximum critical temperature $T_{\rm c,max}$ set by the chemistry of the parent material, which determines its oxygen hole content. The higher the O hole content the higher $T_{\rm c,max}$ that can be achieved by actual doping. These findings also offer a strategy for finding cuprates with higher $T_{\rm c,max}$.

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