Direct observation of phase separation in La1−x CaxMnO3

Loshkareva, N. N.; Sukhorukov, Yu. P.; Наумов, С. В.; Solin, N. I.; Smolyak, I. B.; Панфилова, Е. В.

doi:10.1134/1.567827

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…The resistivity exhibits a downturn at T C but it still increases at lower temperature 26 . Our results agree with previous publications, where the metal/insulator transition at T C has been observed at x Ca ≈0.22 27,28 , as indicated by the hatched area in the phase diagram (Fig. 1).…”

Section: ) Magnetic Structuresupporting

confidence: 93%

Approach to the metal-insulator transition inLa1−xCaxMnO<

et al. 2001

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We describe the evolution of the static and dynamic spin correlations of La1−xCaxMnO3, for x=0.1, 0.125 and 0.2, where the system evolves from the canted magnetic state towards the insulating ferromagnetic state, approaching the metallic transition (x=0.22). In the x=0.1 sample, the observation of two spin wave branches typical of two distinct types of magnetic coupling, and of a modulation in the elastic diffuse scattering characteristic of ferromagnetic inhomogeneities, confirms the static and dynamic inhomogeneous features previously observed at x<0.1. The anisotropic q-dependence of the intensity of the low-energy spin wave suggests a bidimensionnal character for the static inhomogeneities. At x=0.125, which corresponds to the occurence of a ferromagnetic and insulating state, the two spin wave branches reduce to a single one, but anisotropic. At this concentration, an anomaly appears at q0=(1.25,1.25,0), that could be related to an underlying periodicity, as arising from (1.5,1.5,0) superstructures. At x=0.2, the spin-wave branch is isotropic. In addition to the anomaly observed at q0, extra magnetic excitations are observed at larger q, forming an optical branch. The two dispersion curves suggest an anti-crossing behavior at some q0' value, which could be explained by a folding due to an underlying perodicity involving four cubic lattice spacings.

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Section: ) Magnetic Structuresupporting

confidence: 93%

Approach to the metal-insulator transition inLa1−xCaxMnO<

et al. 2001

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“…It was shown earlier [8,9,[17][18][19][20][21][22][23] that the temperature variation of the IR radiation transmission near T C for the optimally doped lanthanum manganites is the same as the temperature variation of the resistance at the MI transition. But in the case of the low doping the metallic phase volume is negligible and the sample stays insulating according to the ρ(T ) dependence.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

“…Research on the large series of the lanthanum manganite films showed that magnetotransmission took place only near T C [2,[17][18][19][20][21][22][23]. Magnetotransmission is the highfrequency analogue of the CMR.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

The evolution of magneto-transport and magneto-optical properties of thin La_0.8Ag_0.1MnO_3+δfilms possessing the in-plane variant structure as a function of the film thickness

Mel’nikov

Sukhorukov

Telegin

et al. 2006

J. Phys.: Condens. Matter

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films of different thicknesses (500-1000 nm) were grown on ZrO 2 (Y 2 O 3 ) substrates. Their optical, magneto-optical and transport properties were studied in order to clarify the effect of the epitaxial variant structure and Ag ion distribution on the conductivity, magnetoresistance and infrared magnetotransmission in these films. An original method was developed for separating MR contributions related to the colossal magnetoresistance near T C and the tunnelling magnetoresistance. It was established that in the La 0.8 Ag 0.1 MnO 3+δ films spin-polarization of electrons P reached ∼0.5. The transverse Kerr effect revealed the irregular distribution of Ag ions through the film thickness. The comparison of optical and electrical data implies lower silver content near the film-substrate boundary in relation to that in the domain volume.

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“…The infrared (IR) optical studies 8 of La 1−x Ca x M nO 3 (0.1< x < 0.8) were one of the first to attest the phase separation in manganites. The analysis of diffuse neutron scattering studies of spin correlations in La 1−x Ca x M nO 3 (x < 0.2) single crystal 9 confirms the existence of ferromagnetic (FM) inhomogeneities below T c in the form of platelets with a mean diameter of about 16 Å.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale phase separation in La_0.7Ca_0.3MnO₃films: evidence for texture-driven optical anisotropy

Moskvin¹,

Zenkov²,

Sukhorukov

et al. 2003

J. Phys.: Condens. Matter

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Direct observation of phase separation in La1−x CaxMnO3

Cited by 8 publications

References 5 publications

Approach to the metal-insulator transition inLa1−xCaxMnO<

Approach to the metal-insulator transition inLa1−xCaxMnO<

The evolution of magneto-transport and magneto-optical properties of thin La_0.8Ag_0.1MnO_3+δfilms possessing the in-plane variant structure as a function of the film thickness

Nanoscale phase separation in La_0.7Ca_0.3MnO₃films: evidence for texture-driven optical anisotropy

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Direct observation of phase separation in La1−x CaxMnO3

Cited by 8 publications

References 5 publications

Approach to the metal-insulator transition inLa1−xCaxMnO<

Approach to the metal-insulator transition inLa1−xCaxMnO<

The evolution of magneto-transport and magneto-optical properties of thin La0.8Ag0.1MnO3+δfilms possessing the in-plane variant structure as a function of the film thickness

Nanoscale phase separation in La0.7Ca0.3MnO3films: evidence for texture-driven optical anisotropy

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The evolution of magneto-transport and magneto-optical properties of thin La_0.8Ag_0.1MnO_3+δfilms possessing the in-plane variant structure as a function of the film thickness

Nanoscale phase separation in La_0.7Ca_0.3MnO₃films: evidence for texture-driven optical anisotropy