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SUMMARY:From ferrimagnetic to spin glass behavior and back in lamellar Mn 
 oxides undoped and doped with Co
DTSTART;VALUE=DATE-TIME:20260416T155000Z
DTEND;VALUE=DATE-TIME:20260416T161000Z
DTSTAMP;VALUE=DATE-TIME:20260414T043351Z
UID:indico-contribution-306@fisindico.uniandes.edu.co
DESCRIPTION:Speakers: Andrés Rosales Rivera (Universidad Nacional de Colo
 mbia\, Manizales)\nIn this work we describe magnetization measurements on 
 lamellar Mn oxides un-doped and dope with Co. They show that the magnetic 
 structure of this oxides system is extremely sensitivity to the (Co/Mn) ra
 tio. Special emphasis is given to the inverse susceptibility and the tempe
 rature derivative of the magnetic susceptibility. Interestingly\, the magn
 etic order changes from a typical ferrimagnetic one with two sublattices (
 sample with Co/Mn = 0) to an unconventional ferrimagnetic one with many su
 blattices (sample with Co/Mn = 0.014) and\, subsequently\, to a possible s
 pin glass-type structure (sample with Co/Mn = 0.037)\, before finally back
  to a predominant typical ferrimagnetic order taking place at intermediate
  temperatures (sample with Co/Mn = 0.096) with increasing the (Co/Mn) rati
 o. The behavior of the susceptibility is described by means of its associa
 tion with the spatial range of correlations between the spins of the syste
 m. The possible mechanisms leading to such unusual changes of magnetic ord
 ering are discussed\, including the super exchange interaction\, double ex
 change interaction\, and the frustration associated to such magnetic inter
 actions.\n\nhttps://fisindico.uniandes.edu.co/event/23/contributions/306/
LOCATION:Universidad de los Andes ML-513
URL:https://fisindico.uniandes.edu.co/event/23/contributions/306/
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