FeSe_1−x Te _x superconductors manifest some intriguing electronic properties depending on the value of x. In FeSe single crystal, the nematic phase and Dirac band structure have been observed, while topological surface superconductivity (SC) with the Majorana bound state was found in the crystal of x∼ 0.55. Therefore, the electronic properties of single crystals with 0 < x ⩽ 0.5 are crucial for probing the evolution of those intriguing properties as well as their relations. However, this study is still left blank due to the lack of single crystals because of phase separation. Here, we report the synthesis, magnetization, electronic transport properties, and hydrostatic pressure effect of FeSe_0.67Te_0.33 single crystals free of phase separation. A structural (nematic) transition is visible at T _s = 39 K, below which the resistivity exhibits a Fermi-liquid behavior. Analysis of the upper critical fields suggests that spin-paramagnetic effect should be taken into account for both H || c axis and H || ab plane. A crossover from the low-H quadratic to the high-H quasi-linear behavior is observed in the magnetoresistance, signifying the possible existence of Dirac-cone state. Besides, the strong temperature dependence of Hall coefficient, violation of (modified) Kohler’s rule, and two-band model analysis indicate the multiband effects in FeSe_0.67Te_0.33 single crystals. Hydrostatic pressure measurements reveal that T _s is quickly suppressed with pressure while T _c is monotonically increased up to 2.31 GPa, indicating the competition between nematicity and SC. No signature of magnetic order that has been detected in FeSe_1−x S _x is observed. Our findings fill up the blank of the knowledge on the basic properties of FeSe_1−x Te _x system with low-Te concentrations.

FeSe _{1− x} Te _x超导体根据x的值表现出一些有趣的电子特性。在 FeSe 单晶中，已观察到向列相和狄拉克能带结构，而在x ∼ 0.55的晶体中发现具有 Majorana 束缚态的拓扑表面超导 (SC) 。因此，具有 0 < x ⩽ 0.5 的单晶的电子特性对于探索这些有趣特性的演变及其关系至关重要。然而，由于相分离，缺乏单晶，这项研究仍然是空白的。在这里，我们报告了 FeSe 的合成、磁化、电子传输特性和静水压力效应 _0.67 Te _0.33无相分离的单晶。在T _s = 39 K处可以看到结构（向列）转变，低于该值电阻率表现出费米液体行为。对上临界场的分析表明，对于H ||都应考虑自旋顺磁效应。c轴和H || ab飞机。从低H二次方到高H二次方的交叉在磁阻中观察到准线性行为，表明可能存在狄拉克锥态。此外，霍尔系数的强烈温度依赖性、（修正的）科勒规则的违反和双波段模型分析表明 FeSe _0.67 Te _0.33单晶中存在多波段效应。静水压力测量表明，T _s被压力迅速抑制，而T _c单调增加至 2.31 GPa，表明向列性和 SC 之间存在竞争。在 FeSe _{1− x} S _{x 中}没有检测到磁性有序的特征 被观察到。我们的发现填补了有关具有低 Te 浓度的 FeSe _{1- x} Te _x系统基本特性的知识空白。