摘要

Novel collective phenomena are being revealed under various extreme conditions, which are challenging the current theories and have attracted broad interests over the community. In this talk, I will present observations of exotic behavior emerging in correlated materials by applying either high pressure or high magnetic field. Attentions will be paid to the unconventional superconductivity appearing on the edge of antiferromagnetism and valence instability in heavy fermion metals while tuning their electronic interactions via pressure. The fate of f-electrons at a quantum critical point will be discussed based on the measurements of dHvA effect. The unusual physical properties of the iron pnictides in extremely high magnetic fields will be shown and compared to other layered superconductors. Emphasis will be putted on our recent observations of nearly isotropic upper critical field, the extreme robustness of the magnetic order against magnetic field and the unique Hall resistivity, which indicate the importance of electronic duality in iron pnictides.

报告人简介

袁辉球，男，1974年生，浙江大学物理系长江学者特聘教授。先后在湘潭大学物理系获得学士，硕士学位。随后赴德国马普固体化学物理研究所攻读博士学位，师从重费米子超导的开创者Frank Steglich教授，2003年获德累斯顿工业大学理学博士。博士毕业后，先后在美国伊利诺依大学香槟分校和美国拉斯阿拉莫斯国家实验室从事博士后研究工作。2008年被聘为教育部长江学者特聘教授，受聘于浙江大学物理系。目前作为主要负责人，在筹建浙江大学极端条件物质研究中心。
近期主要集中于低温，高压，强磁场等多重极端条件下关联电子材料中的奇异电子态研究。在重费米子超导与量子相变，非中心对称超导，笼状化合物超导以及铁基超导等领域取得了一系列开创性的研究成果。在Science（1篇）,Nature（2篇） 和Physical Review Letters（6篇）等国际一流学术期刊上发表论文30余篇，目前承担国家重大基础研究计划“量子调控”子课题，国家自然科学基金重点项目等多个课题的研究。