We present a detailed study on the magnetization under high magnetic fields of Tb5Si2Ge2 and Gd5Si2Ge2 compounds. From the Arrott plot construction (A. Arrott, Phys. Rev. 108, 1394 (1957)), we were able to estimate the TC of each structure (M and O(I)) experimentally and found that the TC of the O(I) phase can be directly obtained by extrapolating the TC curve of this phase in the respective phase diagram. Using a physical model based on free energy considerations, one explains the (de)coupling of the magnetic and structural transitions in R5(SixGe1−x)4 (R = Tb, Gd) compounds.
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See supplementary material at http://dx.doi.org/10.1063/1.3640213 for where it is briefly described the Arrott analysis as well as the complementary results on Gd5Si2Ge2 compound.
© 2011 American Institute of Physics.
2011
American Institute of Physics
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