BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Bhanu Mahanti\, Michigan State University\n\n
Classical and q uantum spin systems have played an enormously important role in the study of magnetism. They provide excellent models to understand the ground state magnetic structure and low energy excitations of magnetic systems. In add ition\, they provide a rich arena for studying the physics of interacting many-body systems. In this talk I will discuss a very specific problem\, n amely the observation of an unusual ordering of spins\, the so called uudd states\, in quasi one-dimensional Heisenberg spin chains and anisotropic two-dimensional Heisenberg spin systems. Theoretical work to understand th is and some related issues using both model spin Hamiltonians with competi ng interactions\, exchange anisotropy\, biquadratic exchange etc. and ab initio electronic structure calculations\, will be discussed.  \;
\n DTSTART:20170413T150000Z LOCATION:Physics Building\, Room 313 SUMMARY:Unusual magnetic order in some frustrated spin systems: END:VEVENT END:VCALENDAR