Science / Technology - Colloquium
Monday, November 10, 2008
4:00 PM-5:00 PM
Olin Hall
223
In this presentation I will discuss the frustration effects in some disordered systems. In the first part of this talk I will present the main types of magnets and how is possible to achieve high magnetic fields which have been used for the study of different physical properties of the materials. There are many kinds of compounds and systems who presents frustration and disorder. Frustrated systems have been studied for more than 50 years in materials ranging from spin glasses to quantum magnets. Frustration is a state of matter in which competing interactions cannot be satisfied simultaneously and consequently the ground state is degenerate. The effects of frustration can be identified in many experimental techniques. I will show how these effects are affecting phase transitions in high-temperature superconductors by measuring magnetotransport and DC magnetization. In some magnetic compounds (spin glasses and reentrant compounds) we can observe frustration effects in the Anomalous Hall Effect. Finally, in our current project, it has been proposed theoretically that a natural mineral named Azurite could be considered as a frustrated quantum magnet. We have performed dilatometry technique in order to investigate the magnetic phase diagram of this system.
Cost: FREE
Sponsored by: WPI Physics Department, Dr. Izabela Stroe
Suggested Audiences: College, Adult
E-mail:
izabela@wpi.edu
Phone: 508-831-5249
Last Modified: November 5, 2008 at 1:08 PM
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