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arXiv 1902.03214cond-mat.str-el
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Bi掺杂Eu $_2$ Ir $_2$ O $_7$中的反常晶格收缩和电子相

Anomalous lattice contraction and emergent electronic phases in Bi-doped Eu$_2$Ir$_2$O$_7$

Prachi Telang, Kshiti Mishra, Giacomo Prando, A. K. Sood, Surjeet Singh

摘要:

研究了焦绿石系列(Eu $_{1-x}$ Bi $_x$)$_2$ Ir $_2$ O $_7$对$ 0 \leq x \leq 1$的催化作用。我们发现,对于小$x$,晶格经历了异常收缩,但所有的/所有的和金属到绝缘体的过渡保持稳健,和电阻率接近$1/T$的依赖在低T,这表明接近外尔半金属相,如先前理论预测的。在Eu $_2$ Ir $_2$ O $_7$和Bi $_2$ Ir $_2$ O $_7$之间的边界处,出现了性质上不同的基态,其特征在于其不寻常的金属行为和至少低至$0.02$ K的磁有序的缺失。

英文摘要:

We study the pyrochlore series (Eu$_{1-x}$Bi$_x$)$_2$Ir$_2$O$_7$ for $ 0 \leq x \leq 1$. We show that for small $x$, the lattice undergoes an anomalous contraction but the all-in/all-out and metal-to-insulator transitions remain robust, and the resistivity approaches a $1/T$ dependence at low-T, suggesting proximity to the Weyl semimetallic phase, as previously predicted theoretically. At the boundary between Eu$_2$Ir$_2$O$_7$ and Bi$_2$Ir$_2$O$_7$ a qualitatively different ground state emerges, which is characterized by its unusual metallic behavior and absence of magnetic ordering at least down to $0.02$ K.

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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