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.

Завантаження

Дані завантаження ще не доступні.

Downloads

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.

Номер

Розділ

Статті

Статті цього автора (авторів), які найбільше читають

<< < 1 2 3