项目名称： 低维过渡金属硫属化物超导体的探索和物性研究

项目编号： No.11504329

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 焦文鹤

作者单位： 浙江科技学院

项目金额： 24万元

中文摘要： 低维过渡金属硫属化物是一类兼具结构低维性和关联电子的系列化合物，依其不同构成呈现出丰富多彩的电子基态。在此类二元化合物中，研究人员发现了一系列的超导体，其同时具有多自由度竞争的电子基态和类似于高温超导体的准二维电子结构，但超导机理仍不明确。三元以及三元以上的低维过渡金属硫属化物的构成更加丰富，以其为对象探索和研究新型超导体充满机遇。近年来我们一直致力于新型超导体的探索和机理研究，并在三元过渡金属硫属化物中发现了新的超导体Ta4Pd3Te16。本项目拟在前期的工作基础上，将研究范围扩展到其他的三元以及三元以上的低维过渡金属硫属化物，一方面探索这类化合物中可能存在的新型超导体，通过磁性、输运性质和比热测量研究其物理性质；另一方面对已发现的低维硫属化物超导体通过元素插层或化学掺杂来有效调节能带结构、载流子浓度等参数，寻找超导随调控参数的演化关系并总结规律，同时探索进一步提高转变温度的可能性。

中文关键词： 超导材料；准一维超导体；超导机理；相图

英文摘要： The low-dimensional transition metal chalcogenides are a kind of compounds with both low-dimensional structures and correlated electrons, which show complex electronic ground states depending on the different crystalline structures. Among the transition metal dichalcogenides, researchers discovered a series of new superconductors, which not only show the coexistence of different electronic ground states, but also have the quasi-two-dimensional electronic structures similar to that of high-temperature superconductors. However, there is still no definite conclusions about the superconducting mechanisms for this kind of superconductors. The crystalline forms for low-dimensional transition metal chalcogenides containing the elements more than two are more diverse, taking which as the objects to explore and study new superconductors is full of opportunities. We always focus on the exploration of new superconductors and investigation of superconducting mechanisms in recent years, and have found the new superconductor Ta4Pd3Te16. In this project, we propose to further extend our research field to other transition metal chalcogenides containing the elements more than two, based on our previous work. In one aspect, we will explore other new superconductors in this kind of low-dimensional compounds and study its physical properties with full measurements of electro-transport, magnetic and thermal properties. In the other aspect, by element intercalation or chemical doping into the layered chalcogenide superconductors, we plan to effectively mediate the parameters such as band structure, carrier concentration, and quest for the evolving relation of the superconductivity with mediating parameters to summarize up the law. Moreover, efforts will be made to explore the possibility of further enhancing the critical temperature of this kind of superconductors.

英文关键词： superconducting materials;quasi-one-dimensional superconductors;superconducting mechanisms;phase diagram