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SUMMARY:Defect-induced ferroic states in solid solutions of layered van de
 r Waals
DTSTART;VALUE=DATE-TIME:20260416T161000Z
DTEND;VALUE=DATE-TIME:20260416T163000Z
DTSTAMP;VALUE=DATE-TIME:20260413T235308Z
UID:indico-contribution-322@fisindico.uniandes.edu.co
DESCRIPTION:Speakers: Paula Giraldo Gallo (Universidad de los Andes)\nSoli
 d solutions of transition-metal dichalcogenides (TMDs)\, a family of cuasi
 -2D van der Waals materials\, provide a powerful platform to explore how c
 omposition\, structural symmetry\, and defect chemistry collectively deter
 mine electronic and ferroic properties in layered materials. In particular
 \, the ability to independently tune substitutional disorder and intrinsic
  defect populations offers a route to stabilize emergent phases that are a
 bsent in stoichiometric compounds. These materials therefore offer a versa
 tile framework to investigate how compositional engineering and defect-med
 iated symmetry breaking can generate new functional states.\n\nIn this tal
 k\, I will discuss how alloying different TMDs can be a general strategy t
 o control structural symmetry and electronic instabilities that give rise 
 to multiple ferroic orders. Within this framework\, chemical substitution 
 primarily modifies lattice parameters\, bonding geometry\, and spin–orbi
 t coupling\, while deviations from ideal stoichiometry introduce defect po
 pulations that can locally break inversion symmetry and generate magnetic 
 moments or electric dipoles. The interplay between these two control param
 eters provides a pathway to stabilize magnetic\, polar\, and multiferroic 
 states in otherwise non-ferroic layered materials.\n\nI will illustrate th
 ese ideas with experimental examples from the alloy families WSe2-WTe2 and
  WS2-WTe2\, synthesized as bulk single crystals and characterized through 
 structural\, magnetic\, piezoresponse and transport measurements. In parti
 cular\, the WSe2-WTe2 system reveals a systematic evolution of lattice sym
 metry and unit cell volume with tellurium substitution and the emergence o
 f defect-stabilized magnetic and polar responses as the chalcogen vacancy 
 density increases. By correlating substitution and defect concentration\, 
 a configurational ferroic phase diagram can be constructed that separates 
 paramagnetic–ferromagnetic\, paraelectric-ferroelectric\, and multiferro
 ic regimes. These results highlight how solid-solution engineering in laye
 red van der Waals materials provides a general route to stabilize emergent
  ferroic phases through the coupled control of composition and defects.\n\
 nhttps://fisindico.uniandes.edu.co/event/23/contributions/322/
LOCATION:Universidad de los Andes ML-513
URL:https://fisindico.uniandes.edu.co/event/23/contributions/322/
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