Neutron-diffraction study of the magnetic-field-induced metal-insulator transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>0.3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

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Without a magnetic field ${\mathrm{Pr}}_{0.7}$${\mathrm{Ca}}_{0.3}$${\mathrm{MnO}}_{3}$ exhibits three phase transitions: a change of the lattice symmetry at ${\mathit{T}}_{\mathit{B}}$=200 K, an antiferromagnetic ordering at ${\mathit{T}}_{\mathit{N}}$=140 K, and a canted antiferromagnetism at ${\mathit{T}}_{\mathrm{CA}}$=110 K. Although the resistivity of ${\mathrm{Pr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{MnO}}_{3}$ shows insulating behavior at zero field, it exhibits an insulator-metal (I-M) transition at around 4.0 T at 5 K. An applied field enforces a ferromagnetic spin alignment and drives ${\mathrm{Pr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{MnO}}_{3}$ into the metallic state by actuating the double-exchange mechanism and destroying the charge ordering. This I-M transition at 5 K is accompanied by a large hysteresis.

Journal

  • Physical Review B

    Physical Review B 52 (18), R13145-R13148, 1995-11-01

    American Physical Society (APS)

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