Neutron Structural analysis of La_<1-x>Sr_xMnO_3 : Variation of One-Electron Bandwidth W with Hole Doping
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We have performed neutron powder diffraction measurements for La<SUB>1−<I>x</I></SUB>Sr<I><SUB>x</SUB></I>MnO<SUB>3</SUB> (<I>x</I>=0.00–0.20) at room temperature. We have found that the crystal structure is orthorhombic (<I>Pbnm</I>, <I>Z</I>=4; O) at <I>x</I>≤0.14 and rhombohedral (<I>R</I>\\bar3<I>c</I>, <I>Z</I>=2; R) at <I>x</I>≥0.18, respectively. At this structural phase transition, the averaged Mn–O–Mn bond angle 〈θ〉 discontinuously increases from 160.8° at <I>x</I>=0.14 to 163.5° at <I>x</I>=0.18. We have estimated relative variation of the one-electron bandwidth <I>W</I> of the <I>e</I><SUB>g</SUB>-band, and discussed the insulator-metal behavior induced by hole doping.
- Journal of the Physical Society of Japan
Journal of the Physical Society of Japan 72(3), 709-712, 2003-03-15
The Physical Society of Japan (JPS)