Heavy-fermion metallic state and Mott transition induced by Li-ion intercalation in LiV2O4 epitaxial films
Heavy-fermion metallic state and Mott transition induced by Li-ion intercalation in LiV2O4 epitaxial films
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LiV2O4 外延膜中锂离子嵌入引起的重费米子金属态和莫特跃迁
DOI：
10.1103/physrevb.104.245104
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发表时间：
2021
影响因子：
3.7
通讯作者：
Ohtomo Akira
中科院分区：
文献类型：
--
作者：
Yajima Tatsuya;Soma Takuto;Yoshimatsu Kohei;Kurita Nobuyuki;Watanabe Masari;Ohtomo Akira
尖晶石型在低温下表现出重费米子金属行为，但成分调制对它们的影响尚不清楚。我们实现了高度结晶薄膜的外延生长，并进行了电化学锂离子嵌入（电子掺杂），以研究系统的输运性质的变化。我们发现，在脉冲激光沉积过程中的Li含量的调整是重要的，以获得表现出重费米子金属行为的大块单晶的膜。在低掺杂区，电阻率随电子填充的增加而增加。它们的线性相关性的斜率也增加了根据费米液体模型。在高掺杂制度下，观察到一个莫特转变的锂含量范围内，一个新的尖晶石相和原来的一个共存。结果表明，电子掺杂引起的电子关联和由此产生的莫特转变的增强。
The spinel-typeexhibits heavy-fermion metallic behaviors at low temperatures, but the effect of composition modulation on them is unknown. We realized the epitaxial growth of highly crystallinefilms and conducted the electrochemical Li-ion intercalation (electron doping) to investigate systematic variation of transport properties in. We found that adjustment of Li content during pulsed-laser deposition was important to obtain films exhibiting the heavy-fermion metallic behavior comparable to that of a bulk single crystal. At low doping regime, resistivity increased with increasing electron filling. The slope of their lineardependence also increased in accordance of a Fermi-liquid model. At high doping regime, a Mott transition was observed over a range of Li content where a new spinel phase and the original one coexisted. The results revealed that the electron doping induced enhancement of the electron correlation and the resultant Mott transition.