Temperature dependence of the electronic structure of the charge-ordering manganite<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>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow><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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We study the changes in the occupied density of states of ${\mathrm{Pr}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ as a function of temperature (25\char21{}300 K) using photoemission spectroscopy. The spectral weight transfer across the metal-insulator/charge-ordering/ferromagnetic-antiferromagnetic transition is abrupt and over very large energy scales (up to 1.2 eV from the Fermi level ${E}_{F})$ compared to the transition temperature ${T}_{\mathrm{mi}}=140 \mathrm{K}$ (\ensuremath{\sim}12 meV) and the gap value in the insulating phase (\ensuremath{\sim}100 meV). Negligible changes observed at ${E}_{F}$ in the ferromagnetic-metallic phase above ${T}_{\mathrm{mi}}$ and a weak spectral weight transfer across the ferromagnetic-paramagnetic transition at ${T}_{\mathrm{fp}}=270 \mathrm{K}$ are consistent with negligible change in carrier density above ${T}_{\mathrm{mi}}.$

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  • Physical Review B

    Physical Review B 56 (24), R15513-R15516, 1997-12-15

    American Physical Society (APS)

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