Specific heat study of Ga1-xMnxAs

Details Specific heat study of Ga1-xMnxAs Specific heat study of Ga1-xMnxAs

2010-06-05

arxiv.org/abs/1006.1023v1

Physics

Condensed Matter

Materials Science

12 pages, 5 figures

Scientific paper

Specific heat measurements were used to study the magnetic phase transition in Ga1-xMnxAs. Two different types of Ga1-xMnxAs samples have been investigated. The sample with a Mn concentration of 1.6% shows insulating behavior, and the sample with a Mn concentration of 2.6% is metallic. The temperature dependence of the specific heat for both samples reveals a pronounced lambda-shaped peak near the Curie temperature, which indicates a second-order phase transition in these samples. The critical behavior of the specific heat for Ga1-xMnxAs samples is consistent with the mean-field behavior with Gaussian fluctuations of the magnetization in the close vicinity of TC.

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