Critical behavior of the resistivity of GaMnAs near the Curie temperature

Sh U. Yuldashev; Z. A. Yunusov; Y. H. Kwon; Sang Hoon Lee; R. Ahuja; T. W. Kang

doi:10.1016/j.ssc.2017.07.005

Critical behavior of the resistivity of GaMnAs near the Curie temperature

Sh U. Yuldashev, Z. A. Yunusov, Y. H. Kwon, Sang Hoon Lee, R. Ahuja, T. W. Kang

Department of Physics

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

The effect of the magnetization fluctuations on the resistivity of GaMnAs near the Curie temperature T_C was experimentally studied. It is shown that the determination of T_C from the maximum of the temperature derivative of the resistivity is valid for the samples with a high concentration of free carries. Whereas, for the samples with low concentration of free carriers the T_C coincides with the resistivity maximum. The magnetic specific heat for T>T_C demonstrates the crossover from the one dimensional to the three dimensional critical behavior when the temperature become closer to the Curie temperature. This is explained by the formation of the ferromagnetic phase in the paramagnetic side of the phase transition which is started from Mn-Mn dimers oriented along one direction.

Original language	English
Pages (from-to)	38-41
Number of pages	4
Journal	Solid State Communications
Volume	263
DOIs	https://doi.org/10.1016/j.ssc.2017.07.005
Publication status	Published - 2017 Sep 1

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Keywords

Critical behavior
Diluted magnetic semiconductor
GaMnAs
Phase transition

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

Cite this

Yuldashev, S. U., Yunusov, Z. A., Kwon, Y. H., Lee, S. H., Ahuja, R., & Kang, T. W. (2017). Critical behavior of the resistivity of GaMnAs near the Curie temperature. Solid State Communications, 263, 38-41. https://doi.org/10.1016/j.ssc.2017.07.005

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abstract = "The effect of the magnetization fluctuations on the resistivity of GaMnAs near the Curie temperature TC was experimentally studied. It is shown that the determination of TC from the maximum of the temperature derivative of the resistivity is valid for the samples with a high concentration of free carries. Whereas, for the samples with low concentration of free carriers the TC coincides with the resistivity maximum. The magnetic specific heat for T>TC demonstrates the crossover from the one dimensional to the three dimensional critical behavior when the temperature become closer to the Curie temperature. This is explained by the formation of the ferromagnetic phase in the paramagnetic side of the phase transition which is started from Mn-Mn dimers oriented along one direction.",

keywords = "Critical behavior, Diluted magnetic semiconductor, GaMnAs, Phase transition",

author = "Yuldashev, {Sh U.} and Yunusov, {Z. A.} and Kwon, {Y. H.} and Lee, {Sang Hoon} and R. Ahuja and Kang, {T. W.}",

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AU - Yuldashev, Sh U.

AU - Yunusov, Z. A.

AU - Kwon, Y. H.

AU - Lee, Sang Hoon

AU - Ahuja, R.

AU - Kang, T. W.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - The effect of the magnetization fluctuations on the resistivity of GaMnAs near the Curie temperature TC was experimentally studied. It is shown that the determination of TC from the maximum of the temperature derivative of the resistivity is valid for the samples with a high concentration of free carries. Whereas, for the samples with low concentration of free carriers the TC coincides with the resistivity maximum. The magnetic specific heat for T>TC demonstrates the crossover from the one dimensional to the three dimensional critical behavior when the temperature become closer to the Curie temperature. This is explained by the formation of the ferromagnetic phase in the paramagnetic side of the phase transition which is started from Mn-Mn dimers oriented along one direction.

AB - The effect of the magnetization fluctuations on the resistivity of GaMnAs near the Curie temperature TC was experimentally studied. It is shown that the determination of TC from the maximum of the temperature derivative of the resistivity is valid for the samples with a high concentration of free carries. Whereas, for the samples with low concentration of free carriers the TC coincides with the resistivity maximum. The magnetic specific heat for T>TC demonstrates the crossover from the one dimensional to the three dimensional critical behavior when the temperature become closer to the Curie temperature. This is explained by the formation of the ferromagnetic phase in the paramagnetic side of the phase transition which is started from Mn-Mn dimers oriented along one direction.

KW - Critical behavior

KW - Diluted magnetic semiconductor

KW - GaMnAs

KW - Phase transition

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10.1016/j.ssc.2017.07.005