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Metal–insulator transition in Mg-doped SrRuO3 thin films prepared by laser ablation

Thin films of magnesium doped SrRuO3 (Mg-SRO) have been successfully prepared by laser ablation on SrTiO3 (100) substrates. The stoichiometry, structural, electrical and magnetic properties of the films depend on the substrate temperature (Ts) and oxygen pressure ( ) during deposition. All Mg-SRO fi...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2006-01, Vol.39 (1), p.6-13
Main Authors: Crandles, D A, Mehdi Yazdanian, Mohammad, Razavi, F S
Format: Article
Language:English
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Summary:Thin films of magnesium doped SrRuO3 (Mg-SRO) have been successfully prepared by laser ablation on SrTiO3 (100) substrates. The stoichiometry, structural, electrical and magnetic properties of the films depend on the substrate temperature (Ts) and oxygen pressure ( ) during deposition. All Mg-SRO films are ferromagnetic, but the transport properties and remanent moments vary with Ts and . Metallic films are produced for Ts > = 700 deg C whereas insulating films can be produced with Ts = 500 deg C with . A correlation between lattice parameter, stoichiometry and transport properties has been discovered: the larger lattice parameter correlates with the decreased Ru content and more insulating samples. Insulating samples prepared at Ts = 500 deg C and have stoichiometry close to the SrMg0.15Ru0.85O3 and are ferromagnetic Anderson insulators with transport properties consistent with variable range hopping.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/39/1/002