Quantum magnetism on a frustrated lattice: rare earth pyrochlores

Speaker
Prof. Stephanie Curnoe, MUN
Date
01/05/2014 - 16:30 - 15:30Add to Calendar 2014-05-01 15:30:00 2014-05-01 16:30:00 Quantum magnetism on a frustrated lattice: rare earth pyrochlores  Why are the pyrochlore crystals R2Ti2O7 "quantum" magnets?  Beginning with  this question,this talk will introduce concepts of quantum magnetism on  the pyrochlore lattice. The symmetry of the lattice and of quantum  mechanical spin states will be described. Using symmetry arguments, the  most general form of a spin=1/2 quantum exchange model for the pyrochlore  crystal can be written down.  Symmetry considerations also yield a map  between rare earth spin states and spin=1/2 states, leading to a universal  model of "anisotropic exchange" for rare earth pyrochlores. This model  contains four coupling constants, which have been determined  experimentally for various rare earth pyrochlores. Resnick (Bld 209), seminar room 201 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick (Bld 209), seminar room 201
Abstract

 Why are the pyrochlore crystals R2Ti2O7 "quantum" magnets?  Beginning with 
this question,this talk will introduce concepts of quantum magnetism on 
the pyrochlore lattice. The symmetry of the lattice and of quantum 
mechanical spin states will be described. Using symmetry arguments, the 
most general form of a spin=1/2 quantum exchange model for the pyrochlore 
crystal can be written down.  Symmetry considerations also yield a map 
between rare earth spin states and spin=1/2 states, leading to a universal 
model of "anisotropic exchange" for rare earth pyrochlores. This model 
contains four coupling constants, which have been determined 
experimentally for various rare earth pyrochlores.

תאריך עדכון אחרון : 02/12/2013