Polarized Raman scattering studies of crystal-field excitations in ErNi2B2C

H. Rho, M. V. Klein, and P. C. Canfield
Phys. Rev. B 69, 144420 – Published 20 April 2004
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Abstract

Raman-scattering measurements have been carried out to study magnetic properties of the quaternary magnetic superconductor ErNi2B2C (Tc=10K, TN=6K). The crystal field (CF) of Er3+ splits the 16-fold degenerate 4I15/2 ground-state multiplet of 4f11 electrons into eight Kramers doublets 4Γ6+4Γ7 within the D4h site symmetry. Therefore, one expects seven ground-state CF transitions from the lowest Γ6 state to the higher states. Excitation symmetries and transition characteristics between these levels can be identified systematically by a proper use of the Raman polarization selection rules. As a result, temperature-dependent and polarized Raman-scattering spectra reveal six ground-state CF transitions: 7cm1 (Γ6Γ7), 48cm1 (Γ6Γ6), 56cm1 (Γ6Γ7), 145cm1 (Γ6Γ7), 149cm1 (Γ6Γ6), and 153cm1 (Γ6Γ7). Using the CF transition characteristics of the obtained data, we expect that one unobserved CF level transition (Γ6Γ6) lies between 56cm1 and 145cm1.

  • Received 3 December 2003

DOI:https://doi.org/10.1103/PhysRevB.69.144420

©2004 American Physical Society

Authors & Affiliations

H. Rho1,2, M. V. Klein1, and P. C. Canfield3

  • 1Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Department of Physics, Chonbuk National University, Jeonju 561-756, Korea
  • 3Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Vol. 69, Iss. 14 — 1 April 2004

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