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Phys. Rev. B 77, 094428 (2008) [7 pages]

Inelastic neutron scattering study of crystal field levels in PrOs4As12

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Songxue Chi1, Pengcheng Dai1,2, T. Barnes1,2, H. J. Kang3, J. W. Lynn3, R. Bewley4, F. Ye2, M. B. Maple5, Z. Henkie6, and A. Pietraszko6
1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
2Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
4Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
5Department of Physics, University of California at San Diego, La Jolla, California 92093, USA
6Institute of Low Temperature and Structure Research, Polish Academy of Science, 50-950 Wrocław, Poland

Received 16 January 2008; revised 27 January 2008; published 25 March 2008

We use neutron scattering to study the Pr3+ crystalline electric field (CEF) excitations in the filled skutterudite PrOs4As12. By comparing the observed levels and their strengths under neutron excitation with the theoretical spectrum and neutron excitation intensities, we identify the Pr3+ CEF levels and show that the ground state is a magnetic Γ4(2) triplet, and the excited states Γ1, Γ4(1), and Γ23 are at 0.4, 13, and 23 meV, respectively. A comparison of the observed CEF levels in PrOs4As12 with the heavy fermion superconductor PrOs4Sb12 reveals the microscopic origin of the differences in the ground states of these two filled skutterudites.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.094428
DOI:
10.1103/PhysRevB.77.094428
PACS:
75.47.−m, 71.70.Ch
 
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