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Title: Exchange field effect in the crystal-field ground state of Ce M Al 4 Si 2

The crystal-field ground-state wave functions of the tetragonal, magnetically ordering Kondo lattice materials CeMAl 4Si 2 (M = Rh, Ir, and Pt) are determined in this paper with low-temperature linearly polarized soft-x-ray absorption spectroscopy, and estimates for the crystal-field splittings are given from the temperature evolution of the linear dichroism. Values for the dominant exchange field in the magnetically ordered phases can be obtained from fitting the influence of magnetic order on the linear dichroism. The direction of the required exchange field is || c for the antiferromagnetic Rh and Ir compounds, with the corresponding strength of the order of λ ex ≈ 6 meV (65 K). Finally and furthermore, the presence of Kondo screening in the Rh and Ir compound is demonstrated on the basis of the absorption due to f 0 in the initial state.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [3] ;  [3] ;  [5] ;  [6] ;  [1]
  1. Univ. of Cologne (Germany). Inst. of Physics II
  2. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  5. Synchrotron SOLEIL, Saint-Aubin (France)
  6. Hiroshima Univ., Higashi-Hiroshima (Japan). Dept. of Quantum Matter
Publication Date:
Report Number(s):
LA-UR-17-24463
Journal ID: ISSN 2469-9950; TRN: US1800793
Grant/Contract Number:
AC52-06NA25396; 615811
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Cologne (Germany); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); LANL Laboratory Directed Research and Development (LDRD) Program; German Research Foundation (DFG)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; dichroism; RKKY interaction; heavy-fermion systems; crystal-field theory; Kondo lattice model; x-ray absorption spectroscopy; condensed matter & materials physics
OSTI Identifier:
1415392
Alternate Identifier(s):
OSTI ID: 1319974