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Superconductivity and correlation of magnetic moments in Ce 1− x Tb x Ru 2
Author(s) -
Roth S.,
Ibel K.,
Just W.
Publication year - 1974
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889874009423
Subject(s) - condensed matter physics , superconductivity , scattering , ferromagnetism , neutron scattering , transition temperature , zernike polynomials , small angle scattering , magnetic moment , magnetic susceptibility , atmospheric temperature range , range (aeronautics) , correlation function (quantum field theory) , physics , materials science , optics , thermodynamics , optoelectronics , wavefront , dielectric , composite material
The correlation of magnetic moments has been investigated by neutron small‐angle scattering in superconducting and normal Ce 1− x Tb x Ru 2 . Samples with 20% Tb are superconducting below 2.6°K. In these samples ferromagnetic short‐range order is found below 10°K. In spite of a maximum in the static susceptibility at 5°K no transition to long‐range order is observed. In the whole temperature range between 1.5 and 10°K the experimental data can be fitted by an Ornstein–Zernike correlation function. At 1–5°K the correlation length is about 15 Å. No significant change is observed at the superconductive transition temperature. Samples with 40% Tb are not superconducting. The static susceptibility shows a maximum at 13°K. Above this temperature again ferromagnetic short‐range order of the Ornstein–Zernike type is found. Below 13°K the intensity of scattered neutrons drops faster with scattering angle indicating long‐range order.