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• W2040234888 abstract "We present the detailed study of ${mathrm{Sm}}_{1ensuremath{-}x}{mathrm{Ca}}_{x}{mathrm{MnO}}_{3}$ with $0.3<~x<~1$ probed by electrical resistivity, thermoelectric power, magnetic susceptibility, and thermal conductivity measurements between 10 and 320 K. The transport and thermal data are analyzed supposing polaronic carriers and explanation of experimental results is made in coherence with ordering phenomena recently evidenced by electron diffraction and lattice imaging. Sample ${mathrm{Sm}}_{0.7}{mathrm{Ca}}_{0.3}{mathrm{MnO}}_{3}$ an is insulating ferromagnet without any obvious transport anomalies at ${T}_{C}ensuremath{cong}95mathrm{K}.$ Contrary to that, the compounds with $0.4<~x<~0.75$ exhibit, at critical temperature ${T}_{mathrm{crit}},$ distinct anomalies in transport and magnetism. Respecting the recent electron microscopy results, these anomalies can be associated to the real space charge ordering of ${mathrm{Mn}}^{3+}/{mathrm{Mn}}^{4+}$ ions, i.e., ${T}_{mathrm{crit}}{=T}_{mathrm{CO}}.$ Our experimental data indicate, however, that long-range antiferromagnetic order likely develops at ${T}_{N}ensuremath{sim}130mathrm{K},$ i.e., well below ${T}_{mathrm{CO}}.$ The ${mathrm{Sm}}_{0.2}{mathrm{Ca}}_{0.8}{mathrm{MnO}}_{3}$ sample is a C-type antiferromagnet with p-type conductivity at low temperatures. For the samples with $xensuremath{sim}0.9,$ the paramagnetic highly conducting state is replaced below ${T}_{mathrm{crit}}=110mathrm{K}$ by a ``cluster glass'' ferromagnetic state. The series is completed by a G-type ${mathrm{CaMnO}}_{3}$ antiferromagnet with ${T}_{N}=122mathrm{K}.$ In all studied samples, the heat is conducted mainly by phonons with the mean free path critically limited in dependence of composition and temperature by scattering on impurities (Sm/Ca substitution), dynamic and/or static Jahn-Teller modes and spin fluctuations. Nevertheless, for the samples with $0.6<~x<~0.9,$ which exhibit high electrical resistivity in the paramagnetic state, the thermal conductivity at room temperature comprises significant electronic contribution." @default.
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• W2040234888 date "1999-11-15" @default.
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• W2040234888 title "Interplay between transport, magnetic, and ordering phenomena in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sm</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi …" @default.
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• W2040234888 doi "https://doi.org/10.1103/physrevb.60.14057" @default.
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