Specific heat study of GaMnAs

Shavkat Yuldashev, Khusan Igamberdiev, Sejoon Lee, Younghae Kwon, Yongmin Kim, Hyunsik Im, Anatoly Shashkov, Tae Won Kang

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9 Scopus citations

Abstract

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

Original languageEnglish
Article number073005
JournalApplied Physics Express
Volume3
Issue number7
DOIs
StatePublished - Jul 2010

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