庆祝建校70周年系列学术讲座-2022材料科学前沿讲座

中科院合肥物质科学研究院郝林研究员学术报告

发布者:程静静发布时间:2022-08-05浏览次数:10

报 告 人:郝林

报告题目:Novelelectronic and magnetic properties of antiferromagnetic SrIrO3/SrTiO3 superlattices

报告时间:2022年8月8日(周一)下午15:00

报告地点:物电学院重点实验室428会议室

主办单位:物理与电子工程学院、科学技术研究院 

报告人简介:

2016 年博士毕业于中国科学技术大学物理系,2016年-2020年在美国田纳西大学从事博士后训练,2020年起任职于中国科学院合肥物质科学研究院。长期从事过渡金属氧化物等复杂体系的演生效应研究,近年来利用原子级精准制备、同步辐射等技术对铱氧化物四方晶格体系中的磁电输运、低维磁性等现象开展了系统研究。目前已以第一/通讯作者身份在Nature Physics、Physical Review X、PhysicalReview Letters、Nature Communications等高水平国际学术期刊发表论文二十余篇。2021年获得国家自然科学基金优秀青年科学基金项目(海外)资助。 

报告摘要:

While manipulationof antiferromagnetic (AFM) order arises to the forefront of spintronics, it isa long-standing fundamental problem of correlated electron physics. In thistalk, I will present couple exciting findings in the strong spin-orbit coupledcorrelated system, layered iridates. A series of artificial layered iridates[(SrIrO3)1/(SrTiO3)m] were preparedto engage with  a staggered magneticfield effect due to the strong spin-orbit interaction. By tuning the SrTiO3spacer, the AFM structure of the Mott insulating state can be engineered [1].Upon driving the AFM structure to the two-dimensional limit at m = 2, a hiddenSU(2) symmetry is achieved, which was first proposed in cuprates but neverexperimentally realized. As a result, while the ordering temperature issignificantly reduced by strong critical fluctuations, the staggered magneticfield effect allows an external field to greatly suppress the AFM fluctuationsand enable a giant response of the AFM order [2].  With a partially released charge degree offreedom at m = 1, the staggered magnetic field effect leads to an intriguingpositive anomalous magnetoresistance that probes the AFM susceptibility,because of the strong interplay between charge and longitudinal spin fluctuations[3,4].

 

[1] Lin Hao,et.al, Phys. Rev. Lett. 119, 027204 (2017)

[2] Lin Hao,et.al, Nat. Phys. 14, 806 (2018)

[3] Lin Hao,et.al, Nat. Commun. 10, 5301 (2019)

[4] J. Yang*, LinHao*, et.al, Phys. Rev. Lett. 124, 177601 (2020)