“…2b). These results demonstrate the evidence of an "on" and "off" switch action, identical to that reported in transition metal doped oxide systems of ZnO, TiO 2 , In 2 O 3 and CeO 2 [13,14,19,[23][24][25]. It is important to mention that the similar vacuum annealing of non-doped ZnO could not induce any RTFM in it.…”