Crossover critical behavior of Ga 1-xMn xAs

Sh U. Yuldashev; Kh T. Igamberdiev; Y. H. Kwon; Sanghoon Lee; X. Liu; J. K. Furdyna; A. G. Shashkov; T. W. Kang

doi:10.1103/PhysRevB.85.125202

Crossover critical behavior of Ga _1-xMn _xAs

Sh U. Yuldashev, Kh T. Igamberdiev, Y. H. Kwon, Sanghoon Lee, X. Liu, J. K. Furdyna, A. G. Shashkov, T. W. Kang

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The critical behavior of the ferromagnetic semiconductor Ga _1-xMn _xAs with different concentrations of Mn was experimentally studied by thermal diffusivity measurements in close vicinity of the Curie temperature. Because the inverse of the thermal diffusivity has the same critical behavior as the specific heat, this allowed us to determine the critical exponent α for the samples investigated. As the critical temperature was approached, the value of the critical exponent α, for most of the samples under investigation, showed a clear crossover from the mean-field-like to the Ising-like critical behavior. Investigation of this crossover behavior has enabled us to determine the values of the Ginzburg number and the exchange interaction length in Ga _1-xMn _xAs.

Original language	English
Article number	125202
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.85.125202
Publication status	Published - 2012 Mar 14

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.85.125202

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title = "Crossover critical behavior of Ga 1-xMn xAs",

abstract = "The critical behavior of the ferromagnetic semiconductor Ga 1-xMn xAs with different concentrations of Mn was experimentally studied by thermal diffusivity measurements in close vicinity of the Curie temperature. Because the inverse of the thermal diffusivity has the same critical behavior as the specific heat, this allowed us to determine the critical exponent α for the samples investigated. As the critical temperature was approached, the value of the critical exponent α, for most of the samples under investigation, showed a clear crossover from the mean-field-like to the Ising-like critical behavior. Investigation of this crossover behavior has enabled us to determine the values of the Ginzburg number and the exchange interaction length in Ga 1-xMn xAs.",

author = "Yuldashev, {Sh U.} and Igamberdiev, {Kh T.} and Kwon, {Y. H.} and Sanghoon Lee and X. Liu and Furdyna, {J. K.} and Shashkov, {A. G.} and Kang, {T. W.}",

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AU - Yuldashev, Sh U.

AU - Igamberdiev, Kh T.

AU - Kwon, Y. H.

AU - Lee, Sanghoon

AU - Liu, X.

AU - Furdyna, J. K.

AU - Shashkov, A. G.

AU - Kang, T. W.

PY - 2012/3/14

Y1 - 2012/3/14

N2 - The critical behavior of the ferromagnetic semiconductor Ga 1-xMn xAs with different concentrations of Mn was experimentally studied by thermal diffusivity measurements in close vicinity of the Curie temperature. Because the inverse of the thermal diffusivity has the same critical behavior as the specific heat, this allowed us to determine the critical exponent α for the samples investigated. As the critical temperature was approached, the value of the critical exponent α, for most of the samples under investigation, showed a clear crossover from the mean-field-like to the Ising-like critical behavior. Investigation of this crossover behavior has enabled us to determine the values of the Ginzburg number and the exchange interaction length in Ga 1-xMn xAs.

AB - The critical behavior of the ferromagnetic semiconductor Ga 1-xMn xAs with different concentrations of Mn was experimentally studied by thermal diffusivity measurements in close vicinity of the Curie temperature. Because the inverse of the thermal diffusivity has the same critical behavior as the specific heat, this allowed us to determine the critical exponent α for the samples investigated. As the critical temperature was approached, the value of the critical exponent α, for most of the samples under investigation, showed a clear crossover from the mean-field-like to the Ising-like critical behavior. Investigation of this crossover behavior has enabled us to determine the values of the Ginzburg number and the exchange interaction length in Ga 1-xMn xAs.

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DO - 10.1103/PhysRevB.85.125202

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JO - Physical Review B - Condensed Matter and Materials Physics

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Crossover critical behavior of Ga _1-xMn _xAs

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