Magnetism of transition metal compounds understood by spin-orbital physics

报告题目：Magnetism of transition metal compounds understood by spin-orbital physics

报告人：吴骅 教授

报告时间：12月06日14：00

报告地点：37-602

内容简介：The diverse magnetic properties of transition metal compounds are largely ascribed to the rich lattice-charge-spin-orbital degrees of freedom and their close interplay. Here we use the spin-orbital physics, in combination with DFT calculations and Monte Carlo simulations, to address the magnetic frustration in the cubic double perovskite Ba2NiIrO6  and the varying magnetism in the lattice distorted Y2NiIrO6 and La2NiIrO6 . As strong magnetic coupling and anisotropy are both highly desirable for the emerging two-dimensional (2D) magnetic materials, here we also discuss the 2D Ising ferromagnetic (FM) semiconductor VI₃ from its spin-orbital states, the large orbital moment and the huge single ion anisotropy (SIA) . Our proposal has been confirmed by several experiments. By referring to a set of specific spin-orbital states which could favor the Ising magnetism, we figure out FeS₂ monolayer is in an unusual high valence but low-spin state, both of which yield strong FM exchange and huge SIA and then make FeS₂ a high T_C 2D Ising ferromagnet.

报告人简介：吴骅教授，1994年安徽大学物理系本科毕业，1999年获中科院固体物理研究所博士学位，2000-2011年先后在德国马普所和德国科隆大学物理系工作，2011年起任复旦大学物理系教授。从事计算凝聚态物理和计算材料科学的研究，提出了首例二维伊辛铁磁半导体材料，预言了表面吸附原子破纪录的超强磁各向异性，阐明了氧化物电子学材料和自旋电子学材料中丰富的自旋轨道物理，并被实验证实和广泛引证。已发表论文百余篇，引用逾万次。吴骅教授现任计算物质科学教育部重点实验室副主任、上海市物理学会计算物理专业委员会主任。曾担任复旦大学物理系党委书记，现任复旦大学“双一流”建设办公室主任兼上海医学院学科规划与“双一流”建设办公室主任。