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- W2788499702 abstract "We report a combined experimental and theoretical x-ray magnetic circular dichroism (XMCD) spectroscopy study at the Ir-${L}_{2,3}$ edges on the ${mathrm{Ir}}^{5+}$ ions of the layered hybrid solid state oxide ${mathrm{Sr}}_{2}{mathrm{Co}}_{0.5}{mathrm{Ir}}_{0.5}{mathrm{O}}_{4}$ with the ${mathrm{K}}_{2}{mathrm{NiF}}_{4}$ structure. From theoretical simulation of the experimental Ir-${L}_{2,3}$ XMCD spectrum, we found a deviation from a pure ${J}_{mathrm{eff}}=0$ ground state with an anisotropic orbital-to-spin moment ratio (${L}_{x}/2{S}_{x}=0.43$ and ${L}_{z}/2{S}_{z}=0.78$). This deviation is mainly due to multiplet interactions being not small compared to the cubic crystal field and due to the presence of a large tetragonal crystal field associated with the crystal structure. Nevertheless, our calculations show that the energy gap between the singlet ground state and the triplet excited state is still large and that the magnetic properties of the ${mathrm{Ir}}^{5+}$ ions can be well described in terms of singlet Van Vleck paramagnetism." @default.
- W2788499702 created "2018-03-06" @default.
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- W2788499702 date "2018-06-29" @default.
- W2788499702 modified "2023-10-18" @default.
- W2788499702 title "Probing the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>J</mml:mi><mml:mi>eff</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:math> ground state and the Van Vleck paramagnetism of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msup><mml:mrow><mml:mi>Ir</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math> ions in layered <mml:math xmlns:mml=http://www.w3.org/1998/…" @default.
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- W2788499702 doi "https://doi.org/10.1103/physrevb.97.214436" @default.
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