  The search for long electron phase coherence length, which is the length that
an electron can keep its quantum wave-like properties, has attracted
considerable interest in the last several decades. Here, we report the long
phase coherence length of ~ 3.7 micro meters in La-doped CdO thin films at 2 K.
Systematical investigations of the La doping and the temperature dependences of
the electron mobility and the electron phase coherence length reveal
contrasting scattering mechanisms for these two physical properties.
Furthermore, these results show that the oxygen vacancies could be the dominant
scatters in CdO thin films that break the electron phase coherence, which would
shed light on further investigation of phase coherence properties in oxide
materials.
