Inelastic neutron scattering studies of Crystal Field Levels in PrOs$_4$As$_{12}$

Details Inelastic neutron scattering studies of Crystal Field Levels in PrOs$_4$As$_{12}$ Inelastic neutron scattering studies of Crystal Field Levels in PrOs$_4$As$_{12}$

2008-02-19

arxiv.org/abs/0802.2539v1

Phys. Rev. B 77, 094428 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.77.094428

We use neutron scattering to study the Pr$^{3+}$ crystalline electric field (CEF) excitations in the filled skutterudite PrOs$_4$As$_{12}$. By comparing the observed levels and their strengths under neutron excitation with the theoretical spectrum and neutron excitation intensities, we identify the Pr$^{3+}$ CEF levels, and show that the ground state is a magnetic $\Gamma_4^{(2)}$ triplet, and the excited states $\Gamma_1$, $\Gamma_4^{(1)}$ and $\Gamma_{23}$ are at 0.4, 13 and 23 meV, respectively. A comparison of the observed CEF levels in PrOs$_4$As$_{12}$ with the heavy fermion superconductor PrOs$_4$Sb$_{12}$ reveals the microscopic origin of the differences in the ground states of these two filled skutterudites.

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