Abstract
We have been able to induce a linear dichroic signal in the Yb M(5) x-ray absorption white line of cubic YbInNi(4) by the application of a magnetic field. The nonzero integrated intensity of the magnetic field induced dichroic spectrum indicates a net noncubic 4f orbital polarization. A quantitative analysis of the temperature and field strength dependence establishes that the crystal-field ground state is a Γ(8) quartet. The results demonstrate the potential of magnetic field induced linear dichroism as a new powerful approach for the investigation of the degeneracy and orbital degrees of freedom of cubic heavy-fermion and Kondo systems.
Highlights
Magnetic field induced orbital polarization in cubic YbInNi4: determining the quartet ground state using x-ray linear dichroism
The results demonstrate the potential of magnetic field induced I linear dichroism as a new powerful approach for the investigation of the degeneracy and orbital P degrees of freedom of cubic heavy fermion and Kondo systems
CO U We have recently shown that polarization dependent B soft x-ray absorption spectroscopy (XAS) at the rare I earth M4,5 edges is a very powerful method to deterW R mine the crystal-field (CF) ground state wave function of tetragonal 4f Kondo and heavy-fermion systems [1
Summary
Magnetic field induced orbital polarization in cubic YbInNi4: determining the quartet ground state using x-ray linear dichroism. We calculate the corresponding 3d→4f XAS, which all consist of one single line: the final state has a full 4f 14 shell, and the intensity is all concentrated in the 3d5/2 resonance (M5 absorption edge) since transitions to the 3d3/2 state (M4 absorption edge) are dipole forbidden in the limit that the CF splitting is negligible compared to the 4f spin-orbit interaction None of these CF states show a polarization dependence for linearly polarized x-rays coming in with the electric field vector E parallel (red) or perpendicular (blue dashed) to the [001] crystallographic axis. There will be a linear polarization dependence in the XAS for these two states as illustrated in Fig. 2: the so-called magnetic-field-induced linear dichroic (MILD) signal, i.e. the magnetic-fieldinduced difference of the absorption between linearly po-
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