Percolation limited magnetic order in Eu 1-x Ca x B 6

G. A. Wigger (), E. Felder, M. Weller, S. Streule, H. R. Ott, A. D. Bianchi and Z. Fisk

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 46, issue 2, 231-235

Abstract: We report the results of measurements of the low-temperature specific heat C p (T) and the ac susceptibility χ ac (T) in low applied magnetic fields for a series of samples of Eu 1-x Ca x B 6 . The anomalies in C p (T), together with the results for χ ac (T) and M(H), confirm the onset of phase transitions to long range magnetic order for x > 0.7 and provide evidence that for x ≥ 0.7, the Eu moments, which are captured in large magnetic clusters with magnetic moments of the order of 260 μ B , adopt a spin-glass type ground state. The data set allows to establish the low-temperature [ T,x] phase diagram of this alloy series. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00251-y

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