由于在多个方面具有与铜基和铁基超导体类似的特性，近年来发现的BiS2基超导体引起了广泛关注。这些跨越材料体系的相似点，如结构上由超导层和隔离层交替组成、临界温度对掺杂浓度和晶格参数敏感、费米面靠近拓扑相变等，给高温超导领域带来了很大的对比研究空间。本项目将利用一种比较新的晶格调控技术，即基于压电陶瓷组件的各向异性形变产生技术，在不改变化学组成的情况下从不同方向扰动La(O,F)BiS2超导体的晶格参数和费米面形状，并观察材料电阻率、临界温度等物理特性的变化，来研究材料的微观结构、原子间成键距离和角度、费米面特征等与材料物理性质的关系。本项目的研究将不仅对理解BiS2基超导体的超导机制提供重要支撑，还将在更广泛的范围内，对理解费米面嵌套和费米面拓扑相变对材料特性的影响、低温下结构、磁和超导等各种不稳定性的合作或竞争关系等提供重要帮助，远期将为深入理解高温超导机制贡献力量。

Since the discovery of BiS2 based superconductors in 2012, they, who share similarities in many aspects with Cu- and Fe-based superconductors, have drawn wide attention in the research area of superconductivity. Well known similarities include, for example, (a) that their structures consist of stacked blocking layers and superconducting layers, (b) that their critical superconducting temperature depends substantially on doping and on variation of lattice parameters, and (c) that their Fermi surfaces are close to a topological change at optimal doping, all of which being reminiscent of the properties of Cu- and Fe-based superconductors. These similarities, which come from different superconducting systems, provide much room in comparison study on their superconducting and other properties, and the outcome of such study is believed to be crucial for understanding the mechanisms of high temperature superconductivity. In this work, a relatively new lattice tuning method is going to be applied, i.e. piezo-electric based anisotropic strain tuning method, to disturb the lattice parameters and Fermi surface topology of La(O,F)BiS2, and to study the response of the critical temperature, the temperature dependence of resistivity and upper critical magnetic field as well as other properties of the system. The purpose of this study is to investigate the relationship between the microscopic structure, the bonding angle and distance, the characteristics of the Fermi surface and the physical properties of the system. The outcome of this study is going to be helpful in unrevealing the superconducting mechanism of BiS2 based superconductors, and is also going to be meaningful in a wider range to understand the influence to a superconductor of Lifshitz transition and Fermi surface nesting, and to understand the interplay between structural, magnetic, and superconducting or other instabilities. In the long term this work will contribute to clarifying the mechanisms of high temperature superconductivity.