Published online by Cambridge University Press: 25 August 2015
Let   ${\mathcal{T}}=(T_{t}^{f})_{t\in \mathbb{R}}$  be a special flow built over an IET
 ${\mathcal{T}}=(T_{t}^{f})_{t\in \mathbb{R}}$  be a special flow built over an IET   $T:\mathbb{T}\rightarrow \mathbb{T}$  of bounded type, under a roof function
 $T:\mathbb{T}\rightarrow \mathbb{T}$  of bounded type, under a roof function   $f$  with symmetric logarithmic singularities at a subset of discontinuities of
 $f$  with symmetric logarithmic singularities at a subset of discontinuities of   $T$ . We show that
 $T$ . We show that   ${\mathcal{T}}$  satisfies the so-called switchable Ratner’s property which was introduced in Fayad and Kanigowski [On multiple mixing for a class of conservative surface flows. Invent. Math. to appear]. A consequence of this fact is that such flows are mildly mixing (before, they were only known to be weakly mixing [Ulcigrai. Weak mixing for logarithmic flows over interval exchange transformations.J. Mod. Dynam.3 (2009), 35–49] and not mixing [Ulcigrai. Absence of mixing in area-preserving flows on surfaces. Ann. of Math. (2) 173 (2011), 1743–1778]). Thus, on each compact, connected, orientable surface of genus greater than one there exist flows that are mildly mixing and not mixing.
 ${\mathcal{T}}$  satisfies the so-called switchable Ratner’s property which was introduced in Fayad and Kanigowski [On multiple mixing for a class of conservative surface flows. Invent. Math. to appear]. A consequence of this fact is that such flows are mildly mixing (before, they were only known to be weakly mixing [Ulcigrai. Weak mixing for logarithmic flows over interval exchange transformations.J. Mod. Dynam.3 (2009), 35–49] and not mixing [Ulcigrai. Absence of mixing in area-preserving flows on surfaces. Ann. of Math. (2) 173 (2011), 1743–1778]). Thus, on each compact, connected, orientable surface of genus greater than one there exist flows that are mildly mixing and not mixing.