Hyperfine interactions in CeTsub(2)Gesub(2)(T=Mn,Co) heavy fermions compounds measured by TDPAC
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2001
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INTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS, 12th
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Resumo
Highly correlated electron systems are usually called heavy Fermions and the term
is generally used to designate rare earth and actinide metals, their alloys and intermetallic compounds. The exotic properties associated with these systems are related to a Fermi liquid behavior and, in a free electron model for a metal, refer to the
conduction electron density of states at the Fermi level. CeMn2Ge2 and CeCo2Ge2
are ternary heavy Fermions compounds from the family RT2X2 (R = rare earth or
actinide, T = transition metal and X = Si, Ge) with the body-centered tetragonal
ThCr2Si2-type crystalline structure. The CeMn2X2 compounds are of particular
interest because they are the only, in the whole family, which exhibit magnetic
moments only at the Mn sites. In these compounds, the Mn atoms form a simple
tetragonal lattice. It has been reported [1, 2] that the CeMn2Ge2 has a collinear
commensurate antiferromagnetic ordering with TN = 415 K. At 318 K, there is a
transition to a incommensurate ferromagnetic component of the Mn moments in the
c axis and a helical component in the ab plane. The CeCo2Ge2 has no magnetic moment on the Co atoms and orders antiferromagnetically below 29 K. In the present
work, the magnetic and quadrupole interactions at Ce, Mn and Co sites was investigated by time differential perturbed gamma–gamma angular correlation (TDPAC).
Como referenciar
CARBONARI, A.W.; MESTNIK FILHO, J.; SAXENA, R.N.; DOGRA, R.; COAQUIRA, J.A.H. Hyperfine interactions in CeTsub(2)Gesub(2)(T=Mn,Co) heavy fermions compounds measured by TDPAC. In: EVENSON, W. (ed.); JAEGER, H. (ed.); ZACATE, M.O. (ed.). In: INTERNATIONAL CONFERENCE ON HYPERFINE INTERACTIONS, 12th, Aug. 12-17, 2001, Park City, UT, USA. Proceedings... p. 345-349. Disponível em: http://repositorio.ipen.br/handle/123456789/16381. Acesso em: 19 Feb 2025.
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