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- W2015283676 abstract "Detailed measurements of the magnetic and transport properties of the two ${text{La}}_{1ensuremath{-}x}{text{Ca}}_{x}{text{MnO}}_{3}$ $(x=0.18,text{ }x=0.20)$ single crystals straddling the compositional metal-insulator transition boundary $(0.18ensuremath{le}{x}_{text{c}}ensuremath{le}0.22)$ are summarized. The analysis of magnetization/susceptibility data reveals the occurrence of a second-order/continuous ferromagnetic-paramagnetic phase transition described not only by nearest-neighbor three-dimensional Heisenberg-model exponents $(ensuremath{gamma}=1.387,text{ }ensuremath{beta}=0.365,text{ }ensuremath{delta}=4.783)$ but also with comparable values of the critical temperatures and amplitudes in both the insulating and the metallic samples. The implications of these results in terms of the universality class, the percolation thresholds, and the relative magnitudes of the super-exchange and double-exchange interactions underlying ferromagnetism across this compositionally modulated metal-insulator boundary in this system are discussed." @default.
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- W2015283676 date "2009-06-26" @default.
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- W2015283676 title "Mechanisms underlying ferromagnetism across the metal-insulator transition in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>La</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ca</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>MnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2015283676 doi "https://doi.org/10.1103/physrevb.79.214433" @default.
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