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SUMMARY:Inelastic Neutron Scatterings Reveal Intense Ferromagnetic Fluctua
 tions Preceding Magnetoelastic First-Order Transitions in LaFe13−xSix
DTSTART;VALUE=DATE-TIME:20211125T065700Z
DTEND;VALUE=DATE-TIME:20211125T065800Z
DTSTAMP;VALUE=DATE-TIME:20260718T061750Z
UID:indico-contribution-4347@events01.synchrotron.org.au
DESCRIPTION:Speakers: Dehong Yu (Australian Nuclear Science and Technology
  Organisation)\nFirst-order magnetic transitions are of both fundamental a
 nd technological interest. Of particular interest are giant magnetocaloric
  effects\, which are attributed to first-order magnetic transitions and ha
 ve attracted great attention for solid-state refrigeration applications. H
 ere\, we present a systematic study\, with inelastic and quasielastic neut
 ron scatterings\, on the lattice and spin dynamics in intermetallic LaFe11
 .6Si1.4 and LaFe11.2Si1.8\, which represent one of the most classical gian
 t magnetocaloric systems and undergo first-order and second-order magnetic
  transitions\, respectively. While the two samples show similar spin-phono
 n coupling effect\, LaFe11.6Si1.4 exhibits a much stronger magnetic diffus
 e scattering in the paramagnetic state preceding its first-order magnetic 
 transition\, correlating closely to picosecond ferromagnetic fluctuations.
  These dynamic insights suggest that the spin dynamics dominate the magnet
 oelastic transition and ferromagnetic fluctuations may be universally rele
 vant for magnetocaloric materials [1]. \n\n[1] Zhao Zhang\, et al. PHYSICA
 L REVIEW MATERIALS 5\, L071401 (2021).\n\nhttps://events01.synchrotron.org
 .au/event/146/contributions/4347/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4347/
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