论文标题
通过尖晶石liv $ _ {2} $ o $ $ _ {4} $薄膜结晶性通过外延菌株结晶。
Crystallization of heavy fermions via epitaxial strain in spinel LiV$_{2}$O$_{4}$ thin film
论文作者
论文摘要
混合价值尖晶石liv $ _ {2} $ o $ _ {4} $被称为第一个氧化氧化物重力系统。人们普遍的共识是，相关电子自由度的电荷，自旋和轨道自由度的微妙相互作用在增强准粒子质量的过程中起着至关重要的作用，但是特定机制仍然难以捉摸。 V $^{3+} $和V $^{4+} $离子的电荷订购（CO）不稳定性在几何上被V Pyrochlore Sublattice挫败了从形成远距离CO，降低到$ t $ = 0 K，提议作为该机制的主要候选者。为了揭示隐藏的CO不稳定性，我们从liv $ _ {2} $ o $ $ _ {4} $的单晶薄膜上的基板上应用了外延菌株。 Here we show a strain-induced crystallization of heavy fermions in a LiV$_{2}$O$_{4}$ film on MgO, where a charge-ordered insulator comprising of a stack of V$^{3+}$ and V$^{4+}$ layers along [001], the historical Verwey-type ordering, is stabilized by the in-plane tensile and底物的平面压缩应变。我们发现了[001] Verwey-Type Co，再加上与众不同的[111] Co的实现，证明了重毛顶状态与Demenerate Co dementery Co的近距离，反映了Pyrochlore Lattice的几何挫败感，这支持了CO的不动荡场景，以支持这种机制，以使其背后的机构为重型制作形式而言。
The mixed-valent spinel LiV$_{2}$O$_{4}$ is known as the first oxide heavy-fermion system. There is a general consensus that a subtle interplay of charge, spin, and orbital degrees of freedom of correlated electrons plays a crucial role in the enhancement of quasi-particle mass, but the specific mechanism has remained yet elusive. A charge-ordering (CO) instability of V$^{3+}$ and V$^{4+}$ ions that is geometrically frustrated by the V pyrochlore sublattice from forming a long-range CO down to $T$ = 0 K has been proposed as a prime candidate for the mechanism. To uncover the hidden CO instability, we applied epitaxial strain from a substrate on single-crystalline thin films of LiV$_{2}$O$_{4}$. Here we show a strain-induced crystallization of heavy fermions in a LiV$_{2}$O$_{4}$ film on MgO, where a charge-ordered insulator comprising of a stack of V$^{3+}$ and V$^{4+}$ layers along [001], the historical Verwey-type ordering, is stabilized by the in-plane tensile and out-of-plane compressive strains from the substrate. Our discovery of the [001] Verwey-type CO, together with previous realizations of a distinct [111] CO, evidence the close proximity of the heavy-fermion state to degenerate CO states mirroring the geometrical frustration of the pyrochlore lattice, which supports the CO instability scenario for the mechanism behind the heavy-fermion formation.
