Thermodynamic and magnetic analysis ofRCo9Si4system withR= Pr, Nd and Sm

El-Hagary, M.

doi:10.1051/epjap:2008088

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…However, these levels can be further split by the exchange field of the moments and/or the internal field of the 3d and 4f moments. 13,14,[27][28][29][30][31] Below 1.8 K, C / T increases logarithmically and tends to saturate at further low temperature at ␥ ϳ 200 mJ/ mol-K 2 . This enhancement might indicate the presence of strong correlations between the Ce ions in the Co-dominated ferromagnetic ground state.…”

Section: Methodsmentioning

confidence: 99%

Interplay betweenCo 3dandCe 4fmagnetism in CeCoAsO

et al. 2010

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We have investigated the ground-state properties of polycrystalline CeCoAsO by means of magnetization, specific heat, and solid-state NMR. Susceptibility and specific-heat measurements suggest a ferromagnetic order at about, T C = 75 K. No further transitions are found down to 0.5 K. At 6.5 K a complex Schottky type of anomaly shows up in the specific-heat results. The interplay between Ce 4f and Co 3d magnetism being responsible for that anomaly is discussed. Furthermore 75 As-NMR investigations have been performed to probe the magnetism on a microscopic scale. As-NMR spectra are analyzed in terms of first and second-order quadrupolar interaction. The anisotropic shift component K ab and K c could be derived from the 75 As powder spectra. Towards lower temperature a strong shift anisotropy was found. Nonetheless K iso tracks the bulk susceptibility down to T = 50 K very well. Furthermore the presence of weak correlations among the Ce ions in the ferromagnetic state is discussed. The observed increase in C / T towards lower temperatures supports this interpretation.

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