Observation of the strain-driven charge-ordered state in La0.7Ca0.3MnO3-d thin film with oxygen deficiency

Электpонные свойства металлов и сплавов

Автор(и)

  • V.G. Prokhorov Institute of Metal Physics, National Academy of Sciences of Ukraine, 36 Vernadsky Ave., Kiev, 03142, Ukraine
  • V.A. Komashko Institute of Metal Physics, National Academy of Sciences of Ukraine, 36 Vernadsky Ave., Kiev, 03142, Ukraine
  • G.G. Kaminsky Institute of Metal Physics, National Academy of Sciences of Ukraine, 36 Vernadsky Ave., Kiev, 03142, Ukraine
  • V.L. Svetchnikov NCHREM, Rotterdamseweg 137, 2628AL, Delft, The Netherlands
  • H.W. Zandbergen NCHREM, Rotterdamseweg 137, 2628AL, Delft, The Netherlands
  • Y.P. Lee Department of Physics, Hanyang University, Seoul, 133-791 Korea
  • J.S. Park Department of Physics, Hanyang University, Seoul, 133-791 Korea
  • K.W. Kim Department of Physics, Sunmoon University, Choongnam, 336-840 Korea

Ключові слова:

PACS: 71.30. h, 75.30.Vn, 75.70.-i

Анотація

The magnetic and transport properties of La0.7Ca0.3MnO3-d films with an oxygen deficiency (d≃ 0.1) and a La0.9Ca0.1MnO3 film with the stoichiometric oxygen content are investigated in a wide temperature range. It is shown that the charge-ordered insulating (COI) state is observed for a La0.7Ca0.3MnO2.9 film with thickness d ≤ 30 nm, which manifests mainly a cubic crystal structure with an anomalously small lattice parameter for this composition. An increase in the film thickness (d ≃ 60 nm) leads to a structural transition from the lattice-strained cubic to the relaxed rhombohedral phase, is accompanied by a shift of the Curie point (TC) to lower temperature and a frustration of the COI state. The magnetic and transport properties of the La0.7Ca0.3MnO2.9 film with d ≃ 60 nm are similar to those exhibited by the optimally oxygen-doped La0.9Ca0.1MnO3 film. It is concluded that the formation of the COI state in the La0.7Ca0.3MnO3-d compound is governed by a compression of the crystal lattice rather than accumulation of oxygen vacancies, the low doping of the substituted divalent ions, or electronic phase separation.

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Опубліковано

2002-12-29

Як цитувати

(1)
Prokhorov, V.; Komashko, V.; Kaminsky, G.; Svetchnikov, V.; Zandbergen, H.; Lee, Y.; Park, J.; Kim, K. Observation of the Strain-Driven Charge-Ordered State in La0.7Ca0.3MnO3-d Thin Film With Oxygen Deficiency: Электpонные свойства металлов и сплавов. Fiz. Nizk. Temp. 2002, 29, 161-168.

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