(IMAGE)
Caption
Schematic illustration of hydrogen transport in lanthanum trihydride. The purple and green curves represent the potential energy surfaces of the concerted and single-ion migrations, respectively. The dotted arrows indicate the thermally activated migration picture, in which hydrogen must overcome the energy barrier to migrate. The solid arrows demonstrate the quantum tunneling picture where quantum fluctuations dominate the migration processes over thermal fluctuations. The structural diagrams on the purple and green background illustrate the hydrogen migrating pathways in the concerted and single-ion migrations, respectively.
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