Physics at Virginia

"Metal-Insulator Transition in Phase Change Material Ge2Sb2Se5xTe5-5x"

Zhenyang Xu , University of Virginia - Physics
[Host: Despina Louca]

Ge2Sb2Te5 (GST-225) is a phase change material which has wide use in fabricating random access memories. With different quenching process, the GST-225 could have three different phases: an amorphous phase, an intermediate cubic phase, a crystalline hexagonal phase. The fast transition between amorphous and crystalline phase makes GST-225 an ideal material for RAM with fast speed. In our project, the Se-doped GST-225 materials are grown and studied. At x=0.9 in liquid nitrogen quenched samples, we observe a phase transition from crystalline to amorphous. The transport measurement also confirm that there are metal-insulator transition happen for both furnace cooled samples and liquid N2 quenched samples at this limit. A tentative hypothesis is proposed to explain this metal-insulator transition. 

Condensed Matter Seminar
Thursday, March 21, 2019
11:00 AM
Physics Building, Room 313
Note special time.
Note special room.

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