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28 March 2024
 
  » arxiv » cond-mat/0508528

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Magnetoresistance, specific heat and magnetocaloric effect of equiatomic rare-earth transition-metal magnesium compounds
H. Hartmann ; K. Berggold ; S. Jodlauk ; I. Klassen ; K. Kordonis ; T. Fickenscher ; R. Poettgen ; A. Freimuth ; T. Lorenz ;
Date 22 Aug 2005
Subject Materials Science | cond-mat.mtrl-sci
AbstractWe present a study of the magnetoresistance, the specific heat and the magnetocaloric effect of equiatomic $RET$Mg intermetallics with $RE = { m La}$, Eu, Gd, Yb and $T = { m Ag}$, Au and of GdAuIn. Depending on the composition these compounds are paramagnetic ($RE = { m La}$, Yb) or they order either ferro- or antiferromagnetically with transition temperatures ranging from about 13 to 81 K. All of them are metallic, but the resistivity varies over 3 orders of magnitude. The magnetic order causes a strong decrease of the resistivity and around the ordering temperature we find pronounced magnetoresistance effects. The magnetic ordering also leads to well-defined anomalies in the specific heat. An analysis of the entropy change leads to the conclusions that generally the magnetic transition can be described by an ordering of localized $S=7/2$ moments arising from the half-filled $4f^7$ shells of Eu$^{2+}$ or Gd$^{3+}$. However, for GdAgMg we find clear evidence for two phase transitions indicating that the magnetic ordering sets in partially below about 125 K and is completed via an almost first-order transition at 39 K. The magnetocaloric effect is weak for the antiferromagnets and rather pronounced for the ferromagnets for low magnetic fields around the zero-field Curie temperature.
Source arXiv, cond-mat/0508528
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