Magnetic structures of quaternary intermetallic borocarbides RCo2B2C (R = Dy, Ho, Er)

Autor(es)

ElMassalami, M. ^[1] ; Moreno, R. ^[1] ; Takeya, H. ^[2] ; Ouladdiaf, B. ^[3] ; Lynn, J. W. ^[4] ; Freitas, R. S. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro - Brazil

^[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047 - Japan

^[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9 - France

^[4] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 - USA

^[5] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS-CONDENSED MATTER; v. 21, n. 43 OCT 28 2009.
• Citações Web of Science: 4

Resumo

The magnetic structures of the title compounds have been studied by neutron diffraction. In contrast to the isomorphous RNi2B2C compounds, wherein a variety of exotic incommensurate modulated structures has been observed, the magnetic structure of ErCo2B2C is found to be a collinear antiferromagnet with k = (12, 0, 12) while those of HoCo2B2C and DyCo2B2C are observed to be simple ferromagnets. For all studied compounds, the moments are found to be confined within the basal plane and their magnitudes are comparable to the values obtained from the low-temperature isothermal magnetization measurements. The absence of modulated magnetic structures in the RCo2B2C series (for ErCo2B2C, verified down to 50 mK) is attributed to the quenching of the Fermi surface nesting features. (AU)

• Processo FAPESP: 08/00457-2 - Estudo de novos materiais magneticos: manganitas e frustracao geometrica.
• Beneficiário: Rafael Sá de Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Regular