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Abstract The effect of the magnetization fluctuations on the resistivity of GaMnAs near the Curie temperature T C was experimentally studied. It is shown that the determination of T C… Click to show full abstract
Abstract The effect of the magnetization fluctuations on the resistivity of GaMnAs near the Curie temperature T C was experimentally studied. It is shown that the determination of T C from the maximum of the temperature derivative of the resistivity is valid for the samples with a high concentration of free carries. Whereas, for the samples with low concentration of free carriers the T C coincides with the resistivity maximum. The magnetic specific heat for T>T C demonstrates the crossover from the one dimensional to the three dimensional critical behavior when the temperature become closer to the Curie temperature. This is explained by the formation of the ferromagnetic phase in the paramagnetic side of the phase transition which is started from Mn-Mn dimers oriented along one direction.
Journal Title: Solid State Communications
Year Published: 2017
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