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Magnetic specific heat and spin-glass-like ordering in the pyrochlores: RE2Mo2O7 (RE=Y, Sm, Gd, Ho)

  • Metallurgical Systems and Superconductors
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Abstract

The pyrochlores RE2Mo2O7 (RE=Y, Sm, Gd, Ho) display, with the exception of Ho2Mo2O7, magnetic transitions at 18 K, 68 K, 55 K, respectively. No long-range order occurs. The rare-earth atoms remain in the paramagnetic state down to 1.5 K. The magnetic specific heat behaviour is explained by spin-glass-like ordering of Mo4+ ions, imposing a molecular field of random character on the rare-earth ions, and by crystalline field-splitting effects.

Zusammenfassung

Mit Ausnahme von Ho2Mo2O7 zeigen die Pyrochlore RE2Mo2O7 (RE=Y, Sm, Gd, Ho) Curie-Punkte bei 18K, 68K bzw. 55K. Es existieren keine Fernordnungen. Die Seltenerdenatome verbleiben im paramagnetischen Zustand bis herunter auf 1.5K. Das magnetische spezifische Wärmeverhalten wird mit Aufspaltung seffekten des Kristallfeldes und mit einer spin-glas-artigen Ordnung von Mo4+-Ionen durch ein molekulare Random-Feld erklärt.

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Authors and Affiliations

  1. Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-7000, Stuttgart 80, Germany

    N. P. Raju & E. Gmelin

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  1. N. P. Raju
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  2. E. Gmelin
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Raju, N.P., Gmelin, E. Magnetic specific heat and spin-glass-like ordering in the pyrochlores: RE2Mo2O7 (RE=Y, Sm, Gd, Ho). Journal of Thermal Analysis 40, 341–347 (1993). https://doi.org/10.1007/BF02546585

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