  We study trace ideal properties of the commutators
$[(-\Delta)^{\frac{\epsilon}{2}},M_f]$ of a power of the Laplacian with the
multiplication operator by a function $f$ on $\mathbb R^d$. For a certain range
of $\epsilon\in\mathbb R$, we show that this commutator belongs to the weak
Schatten class $\mathcal L_{\frac d{1-\epsilon},\infty}$ if and only if the
distributional gradient of $f$ belongs to $L_{\frac d{1-\epsilon}}$. Moreover,
in this case we determine the asymptotics of the singular values. Our proofs
use, among other things, the tool of Double Operator Integrals.
