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- W2781508505 abstract "High-pressure x-ray absorption spectroscopy was performed at the Ir $L_3$ and $L_2$ absorption edges of Sr$_3$Ir$_2$O$_7$. The branching ratio of white line intensities continuously decreases with pressure, reflecting a reduction in the angular part of the expectation value of the spin-orbit coupling operator, $leftlangle {bf L} cdot {bf S} rightrangle$. Up to the high-pressure structural transition at 53 GPa, this behavior can be explained within a single-ion model, where pressure increases the strength of the cubic crystal field, which suppresses the spin-orbit induced hybridization of $J_{text{eff}} = 3/2$ and $e_g$ levels. We observe a further reduction of the branching ratio above the structural transition, which cannot be explained within a single-ion model of spin-orbit coupling and cubic crystal fields. This change in $leftlangle {bf L} cdot {bf S} rightrangle$ in the high-pressure, metallic phase of Sr$_3$Ir$_2$O$_7$ could arise from non-cubic crystal fields or a bandwidth-driven hybridization of $J_{text{eff}}=1/2,,3/2$ states, and suggests that the electronic ground state significantly deviates from the $J_{text{eff}}=1/2$ limit." @default.
- W2781508505 created "2018-01-12" @default.
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- W2781508505 date "2018-01-04" @default.
- W2781508505 modified "2023-10-11" @default.
- W2781508505 title "High-pressure insulator-to-metal transition in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math> studied by x-ray absorption spectroscopy" @default.
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- W2781508505 doi "https://doi.org/10.1103/physrevb.97.035106" @default.
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