Magnetic ordering in Sc2CoSi2-type R2FeSi2 (R=Gd, Tb) and R2CoSi2 (R=Y, Gd-Er) compounds
Academic Article
Publication Date:
2016
abstract:
Magnetic andmagnetocaloricpropertiesofSc2CoSi2-type R2TSi2 (R¼Gd-Er, T¼Fe, Co)compoundshave
been studiedusingmagnetizationdata.Theseindicatethepresenceofmixedferromagneticandanti-
ferromagnetic interactionsinthesecompounds.Oneobservesaferromagnetictransitionfollowedbyan
antiferromagnetic orderandafurtherpossiblespin-reorientationtransitionatlowtemperatures.
Compared toGd2{Fe, Co}Si2, theTb2FeSi2 and {Tb-Er}2CoSi2 compounds exhibitremarkablehysteresis
(for e.g.Tb2FeSi2 showsresidualmagnetization Mres/Tb¼2.45 ?B, coercive field Hcoer¼14.9kOe,and
critical field Hcrit5 kOeat5K)possiblyduetothemagnetocrystallineanisotropyoftherareearth.The
R2{Fe, Co}Si2 show relativelysmallmagnetocaloriceffect(i.e.isothermalmagneticentropychange, ?Sm)
around themagnetictransitiontemperature:themaximalvalueofMCEisdemonstratedbyHo2CoSi2
(?Sm¼8.1J/kgKat72Kand ?Sm¼9.4 J/kgKat23Kin field changeof50kOe)andEr2CoSi2 (?Sm
¼13.6J/kgKat32Kand ?Sm¼8.4 J/kgKat12Kin field changeof50kOe)
Iris type:
01.01 Articolo in rivista
Keywords:
Crystal structure; Magnetic entropy; Magnetic properties; Magnetocaloric effect; Rare-earth compounds
List of contributors:
Pani, Marcella
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