Experimental evidence of Cr magnetic moments at low temperature in Cr2A(A=Al, Ge)C

M Jaouen, M Bugnet, N Jaouen, P Ohresser, V Mauchamp, T Cabioc'h, A Rogalev
Journal of Physics. Condensed Matter: An Institute of Physics Journal 2014 April 30, 26 (17): 176002
From x-ray magnetic circular dichroism experiments performed at low temperature on Cr2AlC and Cr2GeC thin films, it is evidenced that Cr atoms carry a net magnetic moment in these ternary phases. It is shown that the Cr magnetization of the Al-based compound nearly vanished at 100 K in agreement with what has been recently observed on bulk. X-ray linear dichroism measurements performed at various angles of incidence and temperatures clearly demonstrate the existence of a charge ordering along the c axis of the structure of Cr2AlC. All these experimental observations support, in part, theoretical calculations claiming that Cr dd correlations have to be considered to correctly describe the structure and properties of these Cr-based ternary phases.

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