Magnetization and ac susceptibility studies of the magnetic phase separation in La0.8Ca0.2MnO3 and La0.78Ca0.22MnO3 single crystals

R. Puzniak, M. I. Tsindlekht, A. Wisniewski, G. Gorodetsky, V. Markovich, I. Fita

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Abstract

Ferromagnetic and transport properties of La0.8Ca0.2MnO3 and La0.78Ca0.22MnO3 single crystals were studied in temperature range 4.2 K<T<300 K and under hydrostatic pressure up to 12 kbar. It was found that the above compounds exhibit different shifts of Curie temperatures TC under pressure. For La0.8Ca0.2MnO3 dTC/dP≈0.3 K/kbar, whereas for La0.78Ca0.22MnO3 a stronger nonlinear increase TC(P) was observed. A significant change of the easy axis magnetization with temperature was found for La0.8Ca0.2MnO3, in the (110) plane. The above effect is almost entirely suppressed by an external pressure of 6 kbar. The ac susceptibility of La0.8Ca0.2MnO3 shows a sharp frequency dependent increase at T = 80 K, upon heating indicating a transition to cluster spin-glass formation. The results observed are discussed regarding a coexistence of ferromagnetic metallic and ferromagnetic insulating phases.

Original languageEnglish
Article number094409
Pages (from-to)944091-944096
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number9
DOIs
StatePublished - 1 Jan 2002

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