Spectroscopic determination of crystal-field levels in CeRh2Si2and CeRu2Si

Thomas Willers

¹

,

D. T. Adroja

²

,

B.D. Rainford

³

et al.

Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10

“…There is some additional faint spectral weight at about 888 and 906 eV in the absorption spectra (indicated by the arrows in Fig. 1 Table I. in 1:2:2 compounds), 35 which is in agreement with recent findings from 3d photoemission spectroscopy. 22 The small 4f 0 contribution implies that the impact of the Kondo effect on the polarization of the 4f 1 absorption edges is minor.…”

“…Our method of choice is x-ray absorption spectroscopy (XAS) at the Ce M 4,5 edge which has shown to be a complementary technique to neutron scattering to determine the GS wave function of CEF split tetragonal cerium compounds. [32][33][34][35] The sensitivity to the initial state symmetry is achieved via the different absorption for light polarized E c (with c being the long tetragonal axis) and E ⊥ c. We now extend this method to an orthorhombic compound where the polarization dependence of the absorption, the linear dichroism (LD), has to be measured for all three directions, i.e. for E a, E b, and E c in order to determine the initial state symmetry.…”

“…Their size is in agreement with previous findings on tetragonal Ce systems. [32][33][34][35] We follow the coherent approach for our simulations, i.e. the XAS spectra are calculated directly from the CEF mixed GS wave functions, the latter being fabricated via CEF parameters since for orthorhombic symmetry the XAS spectra cannot be calculated as incoherent sums of the pure J z spectra.…”

The UE46 PGM-1 beamline at BESSY II

“…• Charge order of high-Tc Superconductors (Blanco-Canosa et al, 2013;Comin et al, 2014;da Silva Neto et al, 2014;Fink et al, 2009;Ghiringhelli et al, 2012) • Coupling of electronic / lattice degrees of freedom in multiferroic materials (Glavic et al, 2013;Partzsch et al, 2011;Schierle et al, 2010;Schmitz-Antoniak et al, 2013;Skaugen et al, 2015) • Microcrystals of novel materials (Leininger et al, 2011;Matsuda et al, 2015) • Interfacial electronic properties in heterostructures (Frano et al, 2013;Wadati et al, 2009) • Element-speci c magnetic hysteresis loops (Radu et al, 2012) • Single molecular magnets (Bernien et al, 2015;Hermanns et al, 2013) • Electronic depth pro les • Electronic ground states and phase transitions in correlated materials (Schmitz et al, 2014;Strigari et al, 2013;Willers et al, 2012Willers et al, , 2011 • Magnetic clusters in carbon nanotubes (Shiozawa et al, 2015) • Nanoparticles for medical applications (Graf et al, 2015) • Magnetic semiconductors (Khalid et al, 2014) …”

Crystal electric field in CeRh2Si2 studied with high-resolution resonant inelastic soft x-ray scattering

“…This system shows a very interesting phase diagram with AFM order and unconventional superconductivity in close proximity and therefore attracts a lot of attention [12][13][14][15][16]. However, the CEF schemes reported in the literature are contradictory both in terms of the observed energy splittings as well as the symmetry and the anisotropy of the CEF levels of the 2 F 5/2 multiplet [17][18][19][20], and still under debate despite more than 20 years of investigations. The previously reported CEF splittings are relatively large (up to 50 meV) and well compatible with the resolution achieved in RIXS to date.…”