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Crystal field splitting and anomalous thermal expansion in YbVO4 |
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| Authors: | JC Nipko C-K Loong S Kern MM Abraham LA Boatner |
| Affiliation: | a Argonne National Laboratory, Argonne, IL 60439-4814, USA b Colorado State University, Fort Collins, CO 80523 USA c Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA |
| Abstract: | We have investigated the Yb3+ crystal-field-level structure in YbVO4 using inelastic magnetic neutron-scattering measurements and crystal-field model calculations. We determined the temperature dependence of the a and c lattice parameters of the tetragonal unit cell by neutron diffraction and observed a minimum at ca. 120 K in the c lattice parameter. This anomaly in the thermal expansion is interpreted as arising from a coupling of the anisotropic low-lying crystal-field states of the Yb3+ ions and the crystal lattice at low temperatures. |
| Keywords: | Crystal fields Thermal expansion Rare-earth orthovanadate |
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