Thermodynamic properties and resistivity of the ferromagnetic semiconductor EuC2

Details Thermodynamic properties and resistivity of the ferromagnetic semiconductor EuC2 Thermodynamic properties and resistivity of the ferromagnetic semiconductor EuC2

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13k3041h&link_type=abstract

New Journal of Physics, Volume 13, Issue 11, pp. 113041 (2011).

Physics

Scientific paper

EuC2 is a ferromagnet with a Curie temperature of TC ≃ 15 K. It is semiconducting with the particularity that the resistivity drops by about five orders of magnitude on cooling through TC, which is therefore called a metal-insulator transition. In this paper, we study the magnetization, specific heat, thermal expansion and the resistivity around this ferromagnetic transition on high-quality EuC2 samples. At TC we observe well-defined anomalies in the specific heat cp(T) and thermal expansion α(T) data. The magnetic contributions of cp(T) and α(T) can satisfactorily be described within a mean-field theory, taking into account the magnetization data. In zero magnetic field, the magnetic contributions of the specific heat and thermal expansion fulfil a Grüneisen scaling, which is not preserved in finite fields. From an estimation of the pressure dependence of TC via Ehrenfest's relation, we expect a considerable increase of TC under applied pressure due to a strong spin-lattice coupling. Furthermore, the influence of weak off-stoichiometries δ in EuC2±δ was studied. It is found that δ strongly affects the resistivity, but hardly changes the transition temperature. In all these aspects, the behaviour of EuC2 strongly resembles that of EuO.

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