title: Magnetic structures of quaternary intermetallic borocarbides RCo(2)B(2)C (R = Dy, Ho, Er).
abstract: The magnetic structures of the title compounds have been studied by neutron diffraction. In contrast to the isomorphous RNi(2)B(2)C compounds, wherein a variety of exotic incommensurate modulated structures has been observed, the magnetic structure of ErCo(2)B(2)C is found to be a collinear antiferromagnet with [Formula: see text] while those of HoCo(2)B(2)C and DyCo(2)B(2)C 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 RCo(2)B(2)C series (for ErCo(2)B(2)C, verified down to 50 mK) is attributed to the quenching of the Fermi surface nesting features.
authors.affiliation: Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Elmassalami
authors.forename: R
authors.initials: R
authors.lastname: Moreno
authors.forename: H
authors.initials: H
authors.lastname: Takeya
authors.forename: B
authors.initials: B
authors.lastname: Ouladdiaf
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.forename: R S
authors.initials: RS
authors.lastname: Freitas