Critical behavior of Ga 1-xMn xAs

Sh U. Yuldashev, Kh T. Igamberdiev, S. J. Lee, Y. H. Kwon, T. W. Kang, Yongmin Kim, Hyunsik Im, A. G. Shashkov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The temperature dependencies of the resistivity, the magnetization, the specific heat and the thermal diffusivity have been conducted in the close vicinity of magnetic phase transition in Ga 1-xMn xAs. Two different types of Ga 1-xMn xAs samples have been investigated. The sample with a Mn concentration of 1.6% shows an insulating behavior and the sample with a Mn concentration of 2.6% is metallic. From the M(T) and M(H) curves by using Arrott plots the Curie temperature and the critical exponents of β, γ, and δ have been determined. The temperature dependencies of the specific heat and thermal diffusivity of Ga 1-xMn xAs samples demonstrated a pronounced λ shaped peak, which indicates an existence of a second-order phase transition in these samples. The specific heat peak maximum is located near the Curie temperature and therefore, it is attributed to the ferromagnetic-paramagnetic phase transition. From detailed analysis of the specific heat and the thermal diffusivity data above and below T C, the value of critical exponent α has been determined. The critical behavior of the specific heat of Ga 1-xMn xAs samples is well described by the mean-field including Gaussian fluctuations model.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 30th International Conference on the Physics of Semiconductors, ICPS-30
Pages673-674
Number of pages2
DOIs
StatePublished - 2011
Event30th International Conference on the Physics of Semiconductors, ICPS-30 - Seoul, Korea, Republic of
Duration: 25 Jul 201030 Jul 2010

Publication series

NameAIP Conference Proceedings
Volume1399
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference30th International Conference on the Physics of Semiconductors, ICPS-30
Country/TerritoryKorea, Republic of
CitySeoul
Period25/07/1030/07/10

Keywords

  • critical behavior
  • Ferromagnetic semiconductors

Fingerprint

Dive into the research topics of 'Critical behavior of Ga 1-xMn xAs'. Together they form a unique fingerprint.

Cite this