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Parimagnetism in RCo$_2$ series (R=Dy, Ho, and Tm) | | C. M. Bonilla
; J. Herrero-Albillos
; A. I. Figueroa
; C. Castan-Guerrero
; J. Bartolome
; I. Calvo-Almazan
; D. Schmitz
; E. Weschke
; L. M. Garcia
; F. Bartolome
; | | Date: |
4 Feb 2013 | | Abstract: | X-ray circular magnetic dichroism (XMCD), longitudinal ($chi_{ac}$) and
transverse (TS) ac magnetic susceptibility have been measured in several
members of the $R$Co$_2$ series ($R$ = Dy, Ho, and Tm) as a function of
temperature and applied magnetic field. We show that parimagnetism is a general
behavior along the $R$Co$_2$ ferrimagnetic series ($R$ being a heavy rare earth
ion). XMCD results evidence the presence of two compensation temperatures,
defining two different parimagnetic configurations, which is a fully unexpected
result. The inverse $chi_{ac}$ curve exhibits a deviation from Curie-Weiss
behavior which is recovered under applied magnetic field. The large excess of
polarizability above the critical temperature proves the existence of an
enhanced effective moment due to the presence of short range magnetic
correlations, which are also observed in TS measurements. The combination of TS
and XMCD measurements allows to depict new magnetic phase diagrams for the
$R$Co$_2$ series. A new scenario allowing to understand the observed
phenomenology as a Griffiths phase-like behavior is proposed, where the
amorphous $R$Co$_2$ represents the undiluted system case. | | Source: | arXiv, 1302.0775 | | Services: | Forum | Review | PDF | Favorites | |
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