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• W1974445583 abstract "We have performed nonresonant x-ray diffraction, resonant soft and hard x-ray magnetic diffraction, soft x-ray absorption, and x-ray magnetic circular dichroism measurements to clarify the electronic and magnetic states of the ${text{Co}}^{3+}$ ions in ${text{GdBaCo}}_{2}{text{O}}_{5.5}$. Our data are consistent with a ${text{Co}}_{text{Py}}^{3+}$ high-spin (HS) state at the pyramidal sites and a ${text{Co}}_{text{O}c}^{3+}$ low-spin (LS) state at the octahedral sites. The structural distortion with a doubling of the $a$ axis ($2{a}_{p}ifmmodetimeselsetexttimesfi{}2{a}_{p}ifmmodetimeselsetexttimesfi{}2{a}_{p}$ cell) shows alternating elongations and contractions of the pyramids, and indicates that the metal-insulator transition is associated with orbital order in the ${t}_{2g}$ orbitals of the ${text{Co}}_{text{Py}}^{3+}$ HS state. This distortion corresponds to an alternating ordering of $xz$ and $yz$ orbitals along the $a$ and $c$ axes for the ${text{Co}}_{text{Py}}^{3+}$. The orbital ordering and pyramidal distortion lead to deformation of the octahedra but the ${text{Co}}_{text{Oc}}^{3+}$ LS state does not allow an orbital order to occur for the ${text{Co}}_{text{Oc}}^{3+}$ ions. The soft x-ray magnetic diffraction results indicate that the magnetic moments are aligned in the $ab$ plane but are not parallel to the crystallographic $a$ or $b$ axes. The orbital order and the doubling of the magnetic unit cell along the $c$ axis support a noncollinear magnetic structure. The x-ray magnetic circular dichroism data indicate that there is a large orbital magnetic contribution to the total ordered Co moment." @default.
• W1974445583 created "2016-06-24" @default.
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• W1974445583 date "2008-08-19" @default.
• W1974445583 modified "2023-10-09" @default.
• W1974445583 title "Magnetic and electronic Co states in the layered cobaltate<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>GdBaCo</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>5.5</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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• W1974445583 doi "https://doi.org/10.1103/physrevb.78.054424" @default.
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