SPM scans the chemical landscape of manganite oxides
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troduce a method that will allow for much greater insight into the reactions and movement of oxygen on these surfaces through atomic-resolution imaging and manipulation.” Writing in the April issue of Applied Physics Letters (DOI:10.1063/ 1.4917299), the team describes a unique form of in situ scanning tunneling microscopy (STM). In traditional STM, a small, electrically biased tip is brought to less than a nanometer from a material’s surface. Quantum mechanical tunneling occurs between the tip and surface; this tunneling depends on the local structure and the density of states, making it an exquisitely sensitive probe of surface chemistry. The Oak Ridge group took this a step further, tuning the bias to both initiate and monitor an electrochemical reaction at the atomic level. This method allowed the group to study a thin film of La0.625Ca0.375MnO3 (LCMO) and observe the formation of oxygen vacancies on the film’s surface. The group’s approach offers significant insight into the electrochemical properties of oxides that will guide other researchers in the field. Steven Spurgeon
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