Gd^{3+}-RE^{3+} Exchange Interactions in Rare-Earth Fluoride Crystals (RE = Ce, Nd, Yb)

• Authors: M. Paradowski , L. Misiak
• Languages of publication: EN

Abstracts

EN

The investigation of Gd^{3+}-doped LaF_3, La_{0.9}Ce_{0.1}F_3, CeF_3, La_{0.9}Nd_{0.1}F_3, LiYF_4, and LiY_{0.9}Yb_{0.1}F_4 single crystals at 4.2 K was carried out in order to study the Gd^{3+}-RE^{3+} exchange interactions (RE = Ce, Nd, Yb). The exchange interactions were estimated by the application of the molecular-field model at liquid-helium temperature, using the g shift from the isostructural diamagnetic hosts LaF_3 and LiYF_4 to the paramagnetic hosts. The lattice dynamics is studied by analysing spin-Hamiltonian parameters in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. It is suggested from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters that the rotational contributions influence the exchange interactions significantly. Further, the distortions caused by the La^{3+}/Ce^{3+}, La^{3+}/Nd^{3+}, and Y^{3+}/Yb^{3+} substitutions affect significantly the 4f^7 electron-phonon interactions, as well as the exchange interactions. The magnitude of the isotropic exchange interactions is larger for more symmetrical charge distribution of the 4f^7 shell.

Keywords

EN

63.20.Kr; 75.30.Et; 75.30.Hx; 76.30.Kg

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 75.30.Hx: Magnetic impurity interactions
• 76.30.Kg: Rare-earth ions and impurities

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 5
• Pages: 445-457

Dates

published

2004-05

received

2004-02-09

Contributors

author

M. Paradowski

• Institute of Physics, Marie Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

L. Misiak

• Institute of Physics, Marie Curie-Skłodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.105.445