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arXiv 1105.2009cond-mat.supr-concond-mat.str-el
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用~(17)O NMR研究超导体YBa2Cu4O8赝能隙区的高压自旋位移

High-pressure spin shifts in the pseudogap regime of superconducting YBa2Cu4O8 as revealed by 17O NMR

Thomas Meissner, Swee K. Goh, Jürgen Haase, Grant V. M. Williams, Peter B. Littlewood

摘要:

利用一种新的NMR对顶砧装置,测量了高压对高温超导体$_2$ OPDMATHABMO在超导转变温度$T_{\rm c}$以上电子性质的影响.结果发现,压力增加自旋位移在所有温度下,在这样一种方式,伪间隙功能几乎消失在63千巴。温度相关的自旋磁化率的这种变化可以通过压力引起的温度相关分量的成比例减少(因子2)和温度无关分量的增加(因子9)来解释,与增加掺杂的效果相反。结果表明,可以利用对顶砧核磁共振研究相关电子材料的电子性质随压力的变化。

英文摘要:

A new NMR anvil cell design is used for measuring the influence of high pressure on the electronic properties of the high-temperature superconductor YBa$_2$Cu$_4$O$_8$ above the superconducting transition temperature $T_{\rm c}$. It is found that pressure increases the spin shift at all temperatures in such a way that the pseudo-gap feature has almost disappeared at 63 kbar. This change of the temperature dependent spin susceptibility can be explained by a pressure induced proportional decrease (factor of two) of a temperature dependent component, and an increase (factor of 9) of a temperature independent component, contrary to the effects of increasing doping. The results demonstrate that one can use anvil cell NMR to investigate the tuning of the electronic properties of correlated electronic materials with pressure.

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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