[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Tue Mar 17 10:37:10 PDT 2015


Date/Time: Tue 2015-03-17 at 13:00

Location:  Auditorium          

Speaker:   Michel Gingras (U Waterloo)

Title:     Order-by-Disorder

Abstract: Has Compelling Experimental Evidence for Order-by-Disorder at Last Been
Found in a Frustrated Magnetic Material? 

In some magnetic systems, known as frustrated magnets, the lattice geometry or the competition between different spin-spin interactions can lead to a sub-exponentially large number of accidentally degenerate classical ground states. Order-by-disorder (ObD) is a concept of central importance in the field of frustrated magnetism. Saddled with large accidental degeneracies, a subset of states, those that support the largest quantum and/or thermal fluctuations, may be selected to form true long-range order. ObD has been discussed extensively on the theoretical front for over 30 years and proposed to be at play in a number of experimental settings. Unfortunately, convincing demonstrations of OBD in real materials have remained scarce. In this talk, I will review the phenomena of thermal and quantum of order-by-disorder and discuss how recent work may have evinced compelling evidence for ObD in some frustrated XY pyrochlore antiferromagnetic materials.



______________________________

General TRIUMF seminar information available at http://www.triumf.ca/home/upcoming-events/about-seminars-lectures



More information about the Triumf-seminars mailing list