  Let $\mu_p(A,B,t)=(tA^p+(1-t)B^p)^{1/p}$ denote the weighted power mean
between positive operators $A$ and $B$. We show that the function $t\to
\|A-\mu_p(A,B,t)\|_2$ is monotonically decreasing whenever $1/2 \leq p \leq 1$.
Hence showing that the weighted power means satisfy Audenaert's
"in-betweenness" property for positive operators for power satisfying $1/2 \leq
p \leq 1$. We also show that when $p>2$ there exist operators for which the
weighted power mean does not satisfy this "in-betweenness" property with
respect to the Euclidean metric.
