We have performed elastic neutron scattering measurements of the staggered magnetization in (FeF{sub 2}){sub m}(CoF{sub 2}){sub n} superlattices. Thermal expansion measurements, which are proportional to the magnetic contribution to the specific heat, wwre also carried out using high resolution x-ray diffraction. One of the two measured samples has thickness of m = n = 4.5 and the other m = 26 and n = 28 monolayers, as determined from high angle x-ray {theta} - 2{theta} scans. In the m = n = 4.5 sample, only one transition is observed T{sub N} = 62.9K. Analysis of the neutron data, including the …
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We have performed elastic neutron scattering measurements of the staggered magnetization in (FeF{sub 2}){sub m}(CoF{sub 2}){sub n} superlattices. Thermal expansion measurements, which are proportional to the magnetic contribution to the specific heat, wwre also carried out using high resolution x-ray diffraction. One of the two measured samples has thickness of m = n = 4.5 and the other m = 26 and n = 28 monolayers, as determined from high angle x-ray {theta} - 2{theta} scans. In the m = n = 4.5 sample, only one transition is observed T{sub N} = 62.9K. Analysis of the neutron data, including the rounding effects, indicates an effective {beta} {approx} 0.42. This does not compare well with the 3D Ising exponent {beta} = 0.325. The X-ray data also shows the existence of only one specific heat anomaly at T = 62.8 K. For the m = 26, n = 28 sample, dips in the staggered magnetization, and peaks in the thermal expansion were observed at T {approx} 40 K and 74 K. The higher temperature anomaly, associated primarily with the FeF{sub 2} layers, is sharper than the lower one, which is presumably rounded by the staggered ordering field improsed by the long range order in the FeF{sub 2} regions on the CoF{sub 2} regions.
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Lederman, D.; Belanger, D. P.; Wang, J.; Han, S. J.; Paduani, C. P.; Ramos, C. A. et al.Neutron and x-ray scattering studies of (FeF{sub 2}){sub m}(CoF{sub 2}){sub n} multilayers,
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June 1, 1993;
Tennessee.
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