Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 10: Functional materials I - Energy storage (organized by MM)

HL 10.3: Vortrag

Montag, 31. März 2014, 10:45–11:00, IFW A

Temperature induced modifications of hydrides in Gd(0001) thin films — •Sara Wanjelik, Samuel Königshofen, Oxana Stolboushkina, and Mathias Getzlaff — Institute of Applied Physics, University of Düsseldorf

Hydrogen in metals has been of great interest in research for the past few decades. But only few investigations are carried out by imaging techniques with a lateral resolution on the nm-scale. Even less research deals with the inital stage of hydride formation. Here we present STM measurements on thin Gadolinium films grown on a W(110) surface concentrating on the inital steps of hydrogen absorption. Absorption of hydrogen at room temperature results in hydride formation. We observe plastic deformations due to the larger volume of the hydrides. On the one hand, disk-like islands with a diameter of approximately 3 nm and a height of 0.3 nm occur, while on the other hand there are connected areas formed by ramps. The islands arrange in chains. It has also been observed that a new feature, a triangular shaped structure appears together with the islands. Maps of the differential conductivity prove that it has a different electronic structure. The origin of the island and the other structure is not fully understood and yet a field of open research. Additionally, we will present modifications of these structures induced by increasing temperature up to that point which they vanish at.