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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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Published in: | Journal of physics. D, Applied physics Applied physics, 2006-01, Vol.39 (1), p.6-13 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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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. |
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ISSN: | 0022-3727 1361-6463 |
DOI: | 10.1088/0022-3727/39/1/002 |