Seminar: "Order induced by disorder in pyrochlore XY antiferromagnets" by Alexei Andreanov

Theory of Quantum Matter would like to invite you to a seminar:

• Title: Order induced by disorder in pyrochlore XY antiferromagnets
• Speaker: Dr. Alexey Andreanov (IBS Center for Theoretical Physics of Complex Systems, Daejeon, Korea)
• Date: Thursday, 28th January
• Time: 14:30-15:30
• Venue: C016, Lab1
• Abstract:
  XY pyrochlore antiferromagnets are well-known to exhibit order-by-disorder through both quantum and thermal selection. We consider the effect of substituting nonmagnetic ions onto the magnetic sites in a pyrochlore XY model with generally anisotropic exchange tuned by a single parameter J±±/J±. The physics is controlled by two points in this space of parameters J±±/J±=±2 at which there are line modes in the ground state and hence an O(L2) ground-state degeneracy intermediate between that of a conventional magnet and a Coulomb phase. At each of these points, single vacancies seed pairs of line defects. Two line defects carrying incompatible spin configurations from different vacancies can cross
  leading to an effective one-dimensional description of the resulting spin texture. In the thermodynamic limit at finite density, we find that dilution selects a state "opposite" to the state selected by thermal and quantum disorder which is understood from the single vacancy limit. The latter finding hints at the possibility that Er_{2-x}Y_xTi2O7 for small x exhibits a second phase transition within the thermally selected Psi2 state into a Psi3 state selected by the quenched disorder.