3.7 GPa下$LaFeAsO_{0.4}H_{0.6}$的核磁共振

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2019-06-04 DOI:10.4279/PIP.110002

N. Fujiwara, M. Takeuchi, T. Kuwayama, Shusaku Nakagawa, S. Iimura, S. Matsuishi, H. Hosono

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引用次数: 0

摘要

一个典型的电子掺杂铁基超导体$LaFeAsO_{1-x}H_x$经历了$x \geq 0.49$的反铁磁(AF)相。我们在$LaFeAsO_{0.4}H_{0.6}$上进行了3.7 GPa的核磁共振测量，以研究压力诱导的QCP附近的磁性。$~^1H$ -NMR谱线宽在低于30 K的低温下变宽，表明有序自旋矩保持在3.7 GPa。从$~^{75}As$的弛豫时间$T_1$证实了有隙和无隙自旋激励在有序态下的共存。根据间隙激励的压力依赖性，估计压力诱导的QCP为4.1 GPa。

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Nuclear magnetic resonance on $LaFeAsO_{0.4}H_{0.6}$ at 3.7 GPa

A prototypical electron-doped iron-based superconductor $LaFeAsO_{1-x}H_x$ undergoes an antiferromagnetic (AF) phase for $x \geq 0.49$. We performed NMR measurements on $LaFeAsO_{0.4}H_{0.6}$ at 3.7 GPa to investigate the magnetic properties in the vicinity of a pressure-induced QCP. The linewidth of $~^1H$-NMR spectra broadens at low temperatures below 30 K, suggesting that the ordered spin moments remain at 3.7 GPa. The coexistence of gapped and gapless spin excitations was confirmed in the ordered state from the relaxation time $T_1$ of $~^{75}As$. The pressure-induced QCP is estimated to be 4.1 GPa from the pressure dependence of the gapped excitation.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.