Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/242856
Type: Artigo
Title: Role of dimensionality in the Kondo CeT X-2 family: the case of CeCd0.7Sb2
Author: Rosa, P. F. S.
Bourg, R. J.
Jesus, C. B. R.
Pagliuso, P. G.
Fisk, Z.
Abstract: Motivated by the presence of competing magnetic interactions in the heavy fermion family CeT X-2 (T = transition metal, X = pnictogen), here we study the novel parent compound CeCd0.7Sb2 by combining magnetization, electrical resistivity, and heat-capacity measurements. Contrary to the antiferromagnetic (AFM) ground state observed in most members of this family, the magnetic properties of our CeCd0.7Sb2 single crystals revealed a ferromagnetic ordering at T-c = 3 K with an unusual soft behavior. By using a mean field model including anisotropic nearest-neighbor interactions and the tetragonal crystalline electric field (CEF) Hamiltonian, a systematic analysis of our macroscopic data was obtained. Our fits allowed us to extract a simple but very distinct CEF scheme, as compared to the AFM counterparts. As in the previously studied ferromagnet CeAgSb2, a pure vertical bar +/- 1/2 > ground state is realized, hinting at a general trend within the ferromagnetic members. More generally, we propose a scenario for the understanding of the magnetism in this family of compounds based on the subtle changes of dimensionality in the crystal structure.
Motivated by the presence of competing magnetic interactions in the heavy fermion family CeT X-2 (T = transition metal, X = pnictogen), here we study the novel parent compound CeCd0.7Sb2 by combining magnetization, electrical resistivity, and heat-capacity measurements. Contrary to the antiferromagnetic (AFM) ground state observed in most members of this family, the magnetic properties of our CeCd0.7Sb2 single crystals revealed a ferromagnetic ordering at T-c = 3 K with an unusual soft behavior. By using a mean field model including anisotropic nearest-neighbor interactions and the tetragonal crystalline electric field (CEF) Hamiltonian, a systematic analysis of our macroscopic data was obtained. Our fits allowed us to extract a simple but very distinct CEF scheme, as compared to the AFM counterparts. As in the previously studied ferromagnet CeAgSb2, a pure vertical bar +/- 1/2 > ground state is realized, hinting at a general trend within the ferromagnetic members. More generally, we propose a scenario for the understanding of the magnetism in this family of compounds based on the subtle changes of dimensionality in the crystal structure.
Subject: Antiferromagnetismo, Resistividade elétrica, Kondo, Efeito
Country: Estados Unidos
Editor: American Physical Society
Citation: Role Of Dimensionality In The Kondo Cet X-2 Family: The Case Of Cecd0.7sb2. Amer Physical Soc, v. 92, p. OCT-2015.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.92.134421
Address: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.134421
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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