Local inspection of magnetic properties in GdMnIn by measuring hyperfine interactions
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2020
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ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th
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Resumo
GdMn2 is a member of a series of Laves phase containing a rare-earth element and a magnetic 3dtransition
metal with very peculiar magnetic properties[1]. Doping with a non-magnetic element such as
indium affects these properties[2,3]. GdMnIn is reported to crystalize in the hexagonal MgNi2-type
structure presenting a spin-glass behavior with no magnetic order attributed to the triangular spin
frustration of magnetic ions[3]. The observed absence of long-range interactions by magnetization
measurements along with the almost impossible measurements with neutron diffraction due to the
presence of Gd with very high neutron absorption cross section makes the investigation of local exchange
interactions in this compound very difficult. In the present work, measurements of hyperfine interactions
at In sites using 111In(111Cd) probe nuclei were carried out by perturbed angular correlations (PAC)
technique to investigate the local magnetic exchange in GdMnIn compound. Results displayed in Fig. 1 for
the behavior of the major component (Vzz) of the electric field gradient (efg) tensor and the distribution
of electric quadrupole frequency () show a strong instability of the electronic environment of In sites
when temperature decreases indicating a Mn-In disorder. The weak magnetic hyperfine field at In sites
also shown in Fig.1 with an anomalous temperature dependence below around 140 K along with the
increase in the angle between Bhf and Vzz directions suggest a weak long-range exchange interaction.
Como referenciar
CABRERA-PASCA, G.A.; MAGNO, J.F.; FERREIRA, W.L.; CAMPOS, A.C.; BOSCH-SANTOS, B.; SALES, T.S.N.; PEREIRA, L.F.D.; BURIMOVA, A.; SAXENA, R.N.; FREITAS, R.S.; CARBONARI, A.W. Local inspection of magnetic properties in GdMnIn by measuring hyperfine interactions. In: ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS, 65th, November 2-6, 2020, Online. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/33052. Acesso em: 19 Apr 2024.
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