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The effect of gold capping on magnetic and transport properties of optimallydoped manganite thin films is studied. An extraordinary suppression ofconductivity and magnetic properties occurs in epitaxial (001)La_0.67Sr_0.33MnO_3 (LSMO) films grown on SrTiO_3 upon deposition of 2 nm ofAu: in the case of ultrathin films of LSMO (4 nm thick) the resistivityincreases by four orders of magnitude while the Curie temperature decreases by180 K. Zero-field 55Mn nuclear magnetic resonance reveals a significantreduction of ferromagnetic double-exchange mechanism in manganite films uponthe gold capping. We find evidence for the formation of a 1.9-nm thick magnetic"dead-layer" at the Au/LSMO interface, associated with the creation ofinterfacial non double-exchange insulating phases.

Modification of magnetic and transport properties of manganite layers in Au/La_0.67Sr_0.33MnO_3/SrTiO_3 interfaces