Photoemission and soft X-ray absorption spectroscopy study of hole-doped CMR double perovskites

Abstract

The electronic structures of Sr2-xKxFeMoO6 (x = 0,0.1,0.2) double perovskites have been investigated by employing photoemission spectroscopy (PES), soft X-ray absorption spectroscopy (XAS), and soft X-ray magnetic circular dichroism (XMCD) near the Fe 2p absorption edge. The substitution of K+ ions for Sr2+ ions causes the increasing Fe2+ component in the Fe2+-Fe3+ mixed-valent states, but little difference in the Fe 2p XMCD spectra. As x increases, the photoemission intensity near the Fermi level decreases, which indicates the decreasing carriers and the decreasing bandwidth of the itinerant t(2g) down arrow states. (c) 2006 Elsevier B.V. All rights reserved.