Photomanipulation of varying magnetism in transition-metal complexes of the square antiprisum type

2015 Fiscal Year Final Research Report

• Project/Area Number: 24540342
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Hokkaido University
• Principal Investigator: Yamamoto Shoji 北海道大学, 理学(系)研究科(研究院), 教授 (90252551)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 光誘起磁性 / 遷移金属錯体 / 遍歴電子磁性 / 群論 / 経路積分法

Outline of Final Research Achievements

We investigate the photoinduced bidirectional magnetism in Cu2[Mo(CN)8] consisting of square-antiprism-type Mo complexes. If we irradiate this material with blue laser light, it turns from paramagnetic to ferromagnetic. When we further irradiate this magnetized state with orrange laser light, the material is again demagnetized strongly.

First we elucidate the ground-state properties through a group-theoretical analysis. There appear a few different types of antiferromagnetism as well as ferromagnetism of our particular interest. With a realistic set of parameters, the material lies in the paramagnetic down to low temperatures. Then we numerically integrate the time-dependent Schroedinger equation and track the magnetization. The magnetization is indeed enhanced by blue laser light irradiation and again reduced by orrange laser light irradiation. Surprisingly, the final steady demagnetized state is qualitatively different from the initial static paramagnetic state.

Free Research Field

物性理論