Specific heat study of Ga1-xMnxAs
Sh. U. Yuldashev, Kh. T. Igamberdiev, Sejoon Lee, Y. H. Kwon, T. W., Kang, Yongmin Kim, Hyunsik Im, and A.G. Shashkov
TL;DR
This study uses specific heat measurements to analyze the magnetic phase transition in Ga1-xMnxAs, revealing a lambda-shaped peak near the Curie temperature and mean-field critical behavior in samples with different Mn concentrations.
Contribution
It provides new insights into the magnetic phase transition in Ga1-xMnxAs through specific heat analysis, highlighting the nature of the transition and critical behavior.
Findings
Lambda-shaped peak near Curie temperature
Second-order phase transition observed
Mean-field behavior with Gaussian fluctuations
Abstract
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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