Effect of Foreign Ions on the Magnetic Properties of Chromium Dioxide

  • Shannon R. D.
    Central Research Department, E. I. du Pont de Nemours and Company, Experimental Station
  • Chamberland B. L.
    Central Research Department, E. I. du Pont de Nemours and Company, Experimental Station
  • Frederick Carol G.
    Central Research Department, E. I. du Pont de Nemours and Company, Experimental Station

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Abstract

Numerous dopant ions were introduced into chromium dioxide at 65 kbar and 1200°C. The effect of 2 mole percent Fe, Ir, and Ru was to raise Tc by 19°, 4°, and 2°, respectively. The effect of 2 percent of 2 percent V, As, Sb, Re, Mo, and W was to lower Tc by 20°, 21°, 10°, 37°, 38°, and 42°, respectively. The saturation moment of the V-, As-, Re-, and W-doped samples was not reduced by more than 4 percent. With the exception of the As-doped sample, the cell dimensions are consistent with the substitution of M5++Cr3+ for 2 Cr4+ or M6++2 Cr3+ for 3 Cr4+.

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