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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2767
DTSTART:20121130T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T041521Z
LAST-MODIFIED:20121126T181658Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Emergent phases of correlated electrons in materials with spin
 -orbit coupling and magnetic frustration.\, Physics Department Colloqu
 ium\, Natalia Perkins\, UW-Madison
DESCRIPTION:Recently spin-orbit coupling (SOC)  effects have become a 
 subject of intensive research across many different disciplines in con
 densed matter physics. In particular\, SOC has been appreciated in cor
 related electron systems with orbital degrees of freedom for its role 
 in creating a new class of electronic states that allow crossed-respon
 ses of the electrons to electric and magnetic fields. The effects of S
 OC are especially pronounced in 4d and 5d transition-metal compounds\,
  which have large intrinsic atomic SOC due to their high atomic weight
 . In these materials electrons are more delocalized than in the 3d sys
 tems\, the Coulomb interaction is effectively screened\, and SOC often
  becomes a dominant interaction\, which makes the hierarchy of energy 
 scales very unusual. This unusual hierarchy of interactions and strong
  entanglement between spin and orbital degrees of freedom in 5d-system
 s  lead  to a variety of interesting ground states but also to novel t
 ypes of elementary excitations which carry both spin and orbital chara
 cteristics and also strongly depend on lattice and bonding geometries.
    Because of these properties 5dsystems might be considered  as  prom
 ising materials for the realization of various emergent quantum phases
 \, such as spin liquids\, topological insulators\, Weyl semimetals\, a
 nd novel magnetically ordered Mott insulators. 3d transition metals ma
 y also exhibit  important SOC if competing interactions such as crysta
 l fields and exchange interactions are suppressed by geometrical frust
 ration of the underlying crystal structures. Examples of this type hav
 e been observed in various 3d-based spinels\, in which the SOC is resp
 onsible for the orthogonal magnetic structure in the V-based spinel Mn
 V2O4\, multiferroic behavior of FeV2O4\, and the spin-orbital liquid s
 tate in the Fe-based spinel FeSc2S4.
URL:https://www.physics.wisc.edu/events/?id=2767
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