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Enhancement of the spin ordering and formation of the charge-ordered state in a strained La 0.7 Ca 0.3 MnO 3 - δ thin film with oxygen deficiency

Enhancement of the spin ordering and formation of the charge-ordered state in a strained La 0.7... The magnetic and the transport properties of La 0.7 Ca 0.3 MnO 3 - δ films with an oxygen deficiency ( δ ≃ 0 . 1 ) and La 0.9 Ca 0.1 MnO 3 film with stoichiometric oxygen content have been investigated in a wide temperature range. It was shown that the charge-ordered insulating (COI) state is observed for the La 0.7 Ca 0.3 MnO 2.9 film with thickness d <~ 30 nm , which has 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, accompanied by a shift of the Curie point to a lower temperature and by frustration of the COI state. The magnetic and transport properties of the La 0.7 Ca 0.3 MnO 2.9 film with d ≃ 60 nm are similar to those exhibited by the optimally oxygen-doped La 0.9 Ca 0.1 MnO 3 film. It is concluded that formation of the COI state in the La 0.7 Ca 0.3 MnO 3 - δ compound is governed by the compression of the crystal lattice rather than accumulation of the oxygen vacancies, low doping of the substituted divalent ions, or an electronic phase separation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Enhancement of the spin ordering and formation of the charge-ordered state in a strained La 0.7 Ca 0.3 MnO 3 - δ thin film with oxygen deficiency

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2004 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.69.014403
Publisher site
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Abstract

The magnetic and the transport properties of La 0.7 Ca 0.3 MnO 3 - δ films with an oxygen deficiency ( δ ≃ 0 . 1 ) and La 0.9 Ca 0.1 MnO 3 film with stoichiometric oxygen content have been investigated in a wide temperature range. It was shown that the charge-ordered insulating (COI) state is observed for the La 0.7 Ca 0.3 MnO 2.9 film with thickness d <~ 30 nm , which has 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, accompanied by a shift of the Curie point to a lower temperature and by frustration of the COI state. The magnetic and transport properties of the La 0.7 Ca 0.3 MnO 2.9 film with d ≃ 60 nm are similar to those exhibited by the optimally oxygen-doped La 0.9 Ca 0.1 MnO 3 film. It is concluded that formation of the COI state in the La 0.7 Ca 0.3 MnO 3 - δ compound is governed by the compression of the crystal lattice rather than accumulation of the oxygen vacancies, low doping of the substituted divalent ions, or an electronic phase separation.

Journal

Physical Review B – American Physical Society (APS)

Published: Jan 1, 2004

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