Synthesis and characterisation of La1−xNaxMnO3+δ thin films manganites

✍ Scribed by I Alessandri; L Malavasi; E Bontempi; M.C Mozzati; C.B Azzoni; G Flor; L.E Depero

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 747 KB
• Volume: 109
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2003.10.046

✦ Synopsis

Optimally sodium doped lanthanum manganite (LNMO) thin films have been grown onto differently oriented NdGaO 3 single crystals substrates by means of radio-frequency (RF)-magnetron sputtering technique, in order to investigate the role of the strain imposed by lattice mismatch on the magnetotransport properties. Films deposited onto NdGaO 3 (1 1 0) experiment a slight in-plane compressive strain that can be tuned by the thickness and allows to achieve colossal magnetoresistive effects. On the contrary, the change of the substrate orientation induces an in-plane tensile strain, making the film insulating. Above observations are explained by considering the effect of distortions of the Mn-O coordination polyhedra.