The Coexistence and Competition of Quantum Phases in Some Electron Correlated Systems
Time:2015-08-07 03:24 Source:未知 Author:chenxiaoqing  Click: 1849

Research Subject:

Multiferroic materials; Graphenes
Principal Investigator:
Prof. Di WU
Research Content & Progress:
Preparation and substitution of Bi(Fe/Mn)O3-type multiferroics are studied systematically. The phase diagram of some manganites was calculated. A new type of strip phase was predicted in 1/4 doped manganese oxides. The multiferroic characteristic is a result of the non-collinear spin structure in these doped manganese oxides, different from conventional exchange frustration mechanism. The multiferroic coexistence temperature is predicted as high as 100 K. A series of manganite single crystals were grown and their structure and properties were studied. A series of epitaxial multiferroic thin films and superlat-tices were fabricated. The relation between structure and properties were studied. The tunnel magnetic resistance (TMR) of junctions based on graphenes were calculated. The oscillation of TMR characteris-tics can be tuned with gate voltage.