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URL:https://murmitoyen.com/events/vanille/udem/detail/678539-study-of-the-m
 agnetic-ground-state-of-a-free-radical-crystal-nit2py-by-electronic-struct
 ure-calculations-reza-moosavi-askari-udem
LOCATION:Polytechnique Montréal - Pavillon J.-Armand-Bombardier\, 5155\, a
 venue Decelles\, Montréal\, QC\, Canada\, H3T 2B1
SUMMARY:Study of the magnetic ground state of a free radical crystal (NIT2P
 y) by electronic structure calculations - Reza Moosavi Askari (UdeM)
DESCRIPTION:Reza Moosavi Askari\, Département de physique\, Université de
  Montréal
\n 
\nséminaire de doctorat
\n 
\nAbstract:
\nBose Einstein 
 Condensate (BEC) describes a transition of a dilute gas of bosons cooled u
 nder a critical temperature until it reaches a state with macroscopic occu
 pation of lowest-energy state. This idea can be extended to the emergence 
 of BEC in quantum magnets by using an approximation of mapping spin system
 s into systems of gases of itinerant hard-core bosons. The number of boson
 s\, which is associated to the longitudinal magnetization\, can be tuned b
 y an external magnetic field acting as a chemical potential.
\nHere\, an o
 rganic molecular quantum magnet will be presented as a candidate for magne
 tic realization of gases of bosons. This purely organic free radical (NIT2
 Py) has a great stability at room temperature and can be condensed into so
 lid. Due to not having a full shell\, NIT2Py bears a magnetic moment. In o
 rder to calculate the strength and signs of magnetic interactions between 
 magnetic moments of different molecules in NIT2Py crystals\, we used elect
 ronic-structure calculations. Finally\, experimental evidences obtained by
  magnetization and specific heat measurements suggest a BEC-like behavior 
 in this organic quantum magnet. This is expected to give rise to a more pr
 ofound understanding of the physics in vicinity of quantum critical points
  (QCPs) triggered by magnetic field\, and bringing light to the exotic qua
 ntum states and phase transitions in this material. 
\n 
\nCette confér
 ence est présentée par le RQMP Versant Nord du Département de physique
  de l'Université de Montréal et le Département de génie physique de
  Polytechnique Montréal.
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