Superconductivity below 0.3 K and a charge-density-wave-like (CDW-like) anomaly at 280 K were observed in EuBiS₂F recently. Here we report a systematic study of structural and transport properties in Eu_0.5Ln_0.5BiS₂F (Ln = La, Ce, Pr, Nd, Sm) by electrical resistivity, magnetization, and specific heat measurements. The lattice constants have a significant change upon rare earth substitution for Eu, suggesting an effective doping. As Ln is changed from Sm to La, the superconducting transition temperature T _c increases from 1.55 K to 2.8 K. In contrast to the metallic parent compound, the temperature dependence of electrical resistivity displays semiconducting-like behavior for all the Eu_0.5 Ln _0.5BiS₂F samples. Meanwhile, the CDW-like anomaly observed in EuBiS₂F is completely suppressed. Unlike the mixed valence state in the undoped compound, Eu ions in these rare-earth-doped samples are mainly divalent. A specific anomaly at 1.3 K resembling that in EuBiS₂F suggests the coexistence of superconductivity and spin glass state for Eu_0.5La_0.5BiS₂F. Coexistence of ferromagnetic order and superconductivity is found below 2.2 K in Eu_0.5Ce_0.5BiS₂F samples. Our results supplies a rich diagram showing that many interesting properties can be induced in BiS₂-based compounds.

最近在 EuBiS ₂ F中观察到低于 0.3 K 的超导性和在 280 K 处的电荷密度波状（CDW 样）异常。在这里，我们报告了通过电阻率、磁化强度和比热测量对 Eu _0.5 Ln _0.5 BiS ₂ F（Ln = La、Ce、Pr、Nd、Sm）的结构和传输特性进行的系统研究。稀土取代 Eu 后，晶格常数发生显着变化，表明有效掺杂。作为LN是从钐变化为镧，超导转变温度Ť _Ç从 1.55 K 增加到 2.8 K。与金属母体化合物相比，对于所有 Eu _0.5 Ln _0.5 BiS ₂ F 样品，电阻率的温度依赖性显示出类似半导体的行为。同时，在 EuBiS ₂ F 中观察到的类似 CDW 的异常被完全抑制。与未掺杂化合物中的混合价态不同，这些稀土掺杂样品中的 Eu 离子主要是二价的。1.3 K 处的特定异常类似于 EuBiS ₂ F 中的异常表明 Eu _0.5 La _0.5 BiS ₂ F的超导性和自旋玻璃态共存。在 Eu 中低于 2.2 K 时发现铁磁有序和超导性共存_0.5 Ce _0.5 BiS ₂ F 样品。我们的结果提供了一个丰富的图表，表明在基于BiS ₂的化合物中可以产生许多有趣的特性。