Nucleation and Development of Clustered State in La1-xSrxCoO3 and La1-xCaxCoO3 Single Crystals at x=0.15

A.V. Lazuta; V.A. Ryzhov; A.I. Kurbakov; V.P. Khavronin; P.L. Molkanov; Ya.M. Mukovskii; A.E. Pestun; R.V. Privezentsev

doi:10.4028/www.scientific.net/SSP.190.679

Paper Titles

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Effects of Non-Magnetic Doping upon Orbital and Magnetic Structures of Lanthanum Manganite
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Nanophase Separation and Magnetic Spin Glass in Nd_2/3Ca_1/3MnO₃
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Nucleation and Development of Clustered State in La_1-xSr_xCoO₃ and La_1-xCa_xCoO₃ Single Crystals at x=0.15
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HomeSolid State PhenomenaSolid State Phenomena Vol. 190Nucleation and Development of Clustered State in...

Nucleation and Development of Clustered State in La_1-xSr_xCoO₃ and La_1-xCa_xCoO₃ Single Crystals at x=0.15

Abstract:

Results of structural neutron diffraction study and data on the transport and magnetic properties (the linear and nonlinear (second and third order) susceptibilities) are presented for the La_1-xSr_xCoO₃and La_1-xCa_xCoO₃ at x = 0.15 single crystals. It is founf that these compounds are insulators and exhibit the rhombohedral R3-c space group. According to the magnetic measurements, the development of the ferromagnetic (F) clustered state proceeds into three stages. On cooling, during the first stage, the F clusters nucleate at the preferential sites that are likely produced by variation in oxygen and doping stoichiometry. The second stage is characterized by sharp increasing the concetraion of the isolated F clusters on cooling. This is the process of the homogeneous nucleation. A coalescence of the isolated F clusters into some large-scale complexes containig some ammount of the domains is associated with the third stage. Note that it is the typical behavior observed at a first order phase transition. The data allow one to determined reliably the temperature boundaries of the stages.

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Solid State Phenomena (Volume 190)

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679-682

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https://doi.org/10.4028/www.scientific.net/SSP.190.679

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Online since:

June 2012

Authors:

A.V. Lazuta, V.A. Ryzhov, A.I. Kurbakov, V.P. Khavronin, P.L. Molkanov, Ya.M. Mukovskii, A.E. Pestun, R.V. Privezentsev

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Clustered State, Cobaltites, Phase Separation, Phase Transition

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