Abstract
With a view to studying the behavior of diluted Tm in a nonmagnetic matrix, we have prepared single crystals of Yb1−xTmxS (0≤x≤0.25). The lattice constant a0 decreases abruptly as x approaches 0.14, which is interpreted as a valence transition of Tm towards 3+. For 50<T<300, χ follows a Curie–Weiss law. The calculated μeff seems to indicate a valence change from 0.7 for x=0.03 to ∼3 as x approaches 0.22, the change following that of a0. The magnetic moment per Tm increases with x (up to x=0.14) for fields up to 150 kOe. For x=0.03, ρ decreases from RT, shows a minimum at 85 K, and increases as −log T. The number of carriers calculated from RH does not correspond to a one-electron contribution per Tm atom for x=0.03, 0.08, and 0.17. The data suggest an intermediate valence of Tm for x<0.14.
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