Are there crystal field levels in UPd2Al3? We answer, THERE ARE

Details Are there crystal field levels in UPd2Al3? We answer, THERE ARE Are there crystal field levels in UPd2Al3? We answer, THERE ARE

2004-12-09

arxiv.org/abs/cond-mat/0412257v2

Acta Physica 2 (2007) 14

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages in RevTex4, 2 figures, in version 2 only title is changed from: Are, or not, CEF levels? We answer, ARE

Scientific paper

We claim that crystal field (CEF) levels exist in UPd2Al3 in contrary to a recent claim of Hiess et al. (cond-mat/0411041) and Bernhoeft et al. (cond-mat/0411042), that there is no experimental evidence for discrete crystal field levels in this superconducting heavy-fermion antiferromagnet. We claim that excitations revealed by Krimmel et al. (J. Phys.: Condens. Matter 8 (1996) 1677 in inelastic-neutron-scattering (INS) studies are i) crystal-field excitations described by us within ii) the 5f3 (U3+) configuration. Moreover, our 5f3 (U3+) scheme, presented in Physica B 276-278 (2000) 803 and in Czech. J. Phys. 54 (2004) D295, provides a clear physical explanation for the 1.7 meV excitation (magnetic exciton) as associated to the removal of the Kramers-doublet ground state degeneracy in the antiferromagnetic state. The crystal-field theory completed by strong intra-atomic correlations and intersite spin-dependent interactions to the Quantum Atomistic Solid State Theory (QUASST), offers the meV energy scale needed for description of magnetic and electronic properties of compounds containing open-shell 3d, 4f, 5f atoms. The derived set of CEF parameters for the U3+ state reproduces both the INS excitations, temperature dependence of the heat capacity, large uranium magnetic moment as well as its direction. PACS: 71.70.E, 75.10.D Keywords: Crystalline Electric Field, Heavy fermion, magnetism, UPd2Al3

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