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- W1639270793 abstract "The magnetic excitation spectra of the electron superconductor ${mathrm{Pr}}_{1.85}$${mathrm{Ce}}_{0.15}$${mathrm{CuO}}_{4}$ and related parent compounds ${mathrm{Pr}}_{2}$${mathrm{CuO}}_{4}$ and ${mathrm{Nd}}_{2}$${mathrm{CuO}}_{4}$ have been determined by inelastic neutron scattering. We observe crystal-field transitions up to about 100 meV within the ${mathrm{Pr}}^{3+}$ $^{3}$${mathit{H}}_{4}$ and ${mathrm{Nd}}^{3+}$ $^{4}$${mathit{I}}_{9/2}$ Russell-Saunders ground multiplets in these materials. We find that a crystal-field treatment of the ${mathrm{Pr}}^{3+}$ and ${mathrm{Nd}}^{3+}$ ions can adequately explain the observed excitation spectra for both ${mathrm{Pr}}_{2}$${mathrm{CuO}}_{4}$ and ${mathrm{Nd}}_{2}$${mathrm{CuO}}_{4}$. The obtained crystal-field parameters are close to values estimated from a superposition-model calculation and Mossbauer data. The ${mathrm{Pr}}^{3+}$ and ${mathrm{Nd}}^{3+}$ wave functions are found to have significant (ensuremath{approxeq}20%) admixture of some states belonging to higher J multiplets. The calculated contributions to the susceptibility of ${mathrm{Pr}}_{2}$${mathrm{CuO}}_{4}$ and ${mathrm{Nd}}_{2}$${mathrm{CuO}}_{4}$ from the crystal-field states agree well with experiments. The observed crystal-field transitions in the superconductor ${mathrm{Pr}}_{1.85}$${mathrm{Ce}}_{0.15}$${mathrm{CuO}}_{4}$ shift to slightly lower energies and are broadened significantly relative to the present compound due to chemical disorder from Ce doping." @default.
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- W1639270793 title "Rare-earth energy levels in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:…" @default.
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- W1639270793 doi "https://doi.org/10.1103/physrevb.48.14001" @default.
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