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Anomalous susceptibility in single crystals of EuCo 2 Si 2 with trivalent Eu: Influence of excited J multiplets
Author(s) -
Seiro Silvia,
Kummer Kurt,
Vyalikh Denis,
CarocaCanales Nubia,
Geibel Christoph
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200892
Subject(s) - excited state , intermetallic , anisotropy , debye model , valence (chemistry) , atmospheric temperature range , magnetic susceptibility , condensed matter physics , single crystal , chemistry , materials science , atomic physics , crystallography , physics , thermodynamics , organic chemistry , alloy , quantum mechanics
We present a detailed study on the physical properties of single crystals of the Eu 3+ intermetallic EuCo 2 Si 2 . The Eu valence was confirmed by X‐ray absorption. At low temperatures, the anisotropic susceptibility can be explained by a Eu 3+ Van Vleck contribution with a crystal field parameter $V_{2}^{0} = 355\,{\rm K}$ , but at high temperatures the data exceed the Van Vleck values significantly. This excess susceptibility is possibly related to the magnetic exchange between the excited Eu multiplets and the conduction band. A γ of 9.6 mJ K −2 mol and a Debye temperature of 322 K were estimated from the low temperature specific heat data. The compound does not undergo any phase transition in the temperature range 2–300 K.