  Dynamic and structural heterogeneities play an important role in glass
transition phenomena and in the formation of amorphous structures. Since
structure and dynamics are mutually related, it is expected that there exists
some relation between them; however, this relation has not been characterized
by a direct experiment. Elucidation of this relation is the key to identifying
the structure responsible for the rapid freezing of atomic motion during the
glass transition. In this study, we simultaneously observed the dynamic and
structural heterogeneities near the glass transition temperature in
Zr50Cu40Al10 using five-dimensional scanning transmission electron microscopy,
which is capable of recording the spatiotemporal distribution of electron
diffraction pattern. Dynamic and structural heterogeneities were visualized
with sub-nanometer resolution upon heating in situ, and a spatial correlation
between them was observed up to the glass transition temperature. Simultaneous
measurements of dynamic and structural heterogeneities directly revealed that
the ordered atomic structure had slow dynamics and that the order decreased
with temperature.
