Magnetic susceptibility of fluoride glasses with 3d and 4f elements |
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Authors: | C. Dupas J.-P. Renard G. Fonteneau J. Lucas |
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Affiliation: | Institut d''Electronique Fondamentale, Laboratoire associé au CNRS, Université Paris XI, 91405 Orsay Cedex, France;Laboratoire de Chimie Minérale D, Laboratoire associé au CNRS, Université de Rennes, Beaulieu, 35042 Rennes-Cedex, France |
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Abstract: | The low field ac magnetic susceptibility has been studied as a function of temperature and frequency in a series of fluoride glasses containing Mn2+, rare-earth ions, or an admixture of the two types. All glasses exhibit magnetic freezing in the 4He or 3He temperature ranges, but the nature of the freezing appears to depend on the local anisotropy. In the case of Mn2+ or Mn2+ -Gd3+ ions, a sharp freezing analogous to that in CuMn was observed. For Ln3+ or Mn2+ -Ln3+ ions (Ln=Dy, Ho), the observed progressive freezing could be of a dynamic nature. |
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