Prof. Hua Wu [Department of Physics, Fudan University, China]

Title: Charge-spin-orbital states and magnetism in transition-metal oxides | 过渡金属氧化物的电荷-自旋-轨道状态及磁性

Time: 2:00 - 3:00 PM, Monday, January 9, 2017

Place: Conference room 410, HPSTAR (Shanghai)

Host: Dr. Wenge Yang

Abstract

Transition-metal oxides often have coupled charge-spin-orbital degrees of freedom and hence display rich properties. In this talk, using crystal-field level diagrams and density functional calculations, we address (1) a record-breaking giant magnetic anisotropy for transition metal adatoms on MgO (001) surface, (2) unusual charge-spin state and strong ferromagnetism in the mixed perovskite SrFe0.5Ni0.5O3, (3) the contrasting magnetism of two new double perovskites Ca2FeOsO6 and Sr2NiIrO6, and (4) spin-orbit coupling driven antiferromagnetism in the Ising spin-chain oxide Sr3NiIrO6. In all these cases, orbital physics and magnetic interactions are discussed, and spin-orbital multiplet and electron correlations are handled by configuration-state constrained LSDA+U calculations.

[1] Phys. Rev. Lett. 115, 257201 (2015).

[2] Phys. Rev. B 94, 214401 (2016).

[3] Phys. Rev. B 90, 054406 (2014); Sci. Rep. 4, 7542 (2014).

[4] Sci. Rep. 4, 4609 (2014).

Biography of the Speaker:

吴骅，复旦大学物理系教授。安徽大学物理系本科，中科院固体所博士(1999)。2000-2011年先后在德国马普所和科隆大学从事科研工作。2011年4月起任复旦大学物理系教授，入选上海市“浦江人才”、上海市“曙光学者”，现担任计算物质科学教育部重点实验室副主任。从事计算凝聚态物理和计算材料科学的研究，主要关注磁电耦合氧化物、自旋电子学材料、关联氧化物中的轨道物理、以及半导体表面和磁性薄膜。已发表60多篇论文，包括12篇PRL和近30篇PRB，论文被引用近2500次。