Resistivity minima and Kondo effect in ferromagnetic GaMnAs films

H. T. He; C. L. Yang; W. K. Ge; J. N. Wang; X. Dai; Y. Q. Wang

doi:10.1063/1.2108131

Resistivity minima and Kondo effect in ferromagnetic GaMnAs films

H. T. He, C. L. Yang, W. K. Ge, J. N. Wang^*, X. Dai, Y. Q. Wang

^*Corresponding author for this work

Department of Physics

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

49 Citations (Scopus)

Abstract

The temperature dependence of the resistivity of ferromagnetic GaMnAs, as-grown or low-temperature-annealed samples is measured from 2 to 290 K. A resistivity minimum is observed with a corresponding temperature TM around 10 K for each sample. Below TM, the resistivity exhibits logarithmic temperature dependence, as α ln (T), and α is independent of the external magnetic field up to 9 T. Such behavior is explained in terms of the Kondo effect arising from the presence of Mn interstitials in the GaMnAs samples. In addition, a well-defined T -squared dependence of resistivity is found in the temperature range between TM and the Curie temperature (TC), which is attributed to single magnon scattering.

Original language	English
Article number	162506
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	87
Issue number	16
DOIs	https://doi.org/10.1063/1.2108131
Publication status	Published - 17 Oct 2005

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title = "Resistivity minima and Kondo effect in ferromagnetic GaMnAs films",

abstract = "The temperature dependence of the resistivity of ferromagnetic GaMnAs, as-grown or low-temperature-annealed samples is measured from 2 to 290 K. A resistivity minimum is observed with a corresponding temperature TM around 10 K for each sample. Below TM, the resistivity exhibits logarithmic temperature dependence, as α ln (T), and α is independent of the external magnetic field up to 9 T. Such behavior is explained in terms of the Kondo effect arising from the presence of Mn interstitials in the GaMnAs samples. In addition, a well-defined T -squared dependence of resistivity is found in the temperature range between TM and the Curie temperature (TC), which is attributed to single magnon scattering.",

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doi = "10.1063/1.2108131",

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T1 - Resistivity minima and Kondo effect in ferromagnetic GaMnAs films

AU - He, H. T.

AU - Yang, C. L.

AU - Ge, W. K.

AU - Wang, J. N.

AU - Dai, X.

AU - Wang, Y. Q.

PY - 2005/10/17

Y1 - 2005/10/17

N2 - The temperature dependence of the resistivity of ferromagnetic GaMnAs, as-grown or low-temperature-annealed samples is measured from 2 to 290 K. A resistivity minimum is observed with a corresponding temperature TM around 10 K for each sample. Below TM, the resistivity exhibits logarithmic temperature dependence, as α ln (T), and α is independent of the external magnetic field up to 9 T. Such behavior is explained in terms of the Kondo effect arising from the presence of Mn interstitials in the GaMnAs samples. In addition, a well-defined T -squared dependence of resistivity is found in the temperature range between TM and the Curie temperature (TC), which is attributed to single magnon scattering.

AB - The temperature dependence of the resistivity of ferromagnetic GaMnAs, as-grown or low-temperature-annealed samples is measured from 2 to 290 K. A resistivity minimum is observed with a corresponding temperature TM around 10 K for each sample. Below TM, the resistivity exhibits logarithmic temperature dependence, as α ln (T), and α is independent of the external magnetic field up to 9 T. Such behavior is explained in terms of the Kondo effect arising from the presence of Mn interstitials in the GaMnAs samples. In addition, a well-defined T -squared dependence of resistivity is found in the temperature range between TM and the Curie temperature (TC), which is attributed to single magnon scattering.

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UR - https://openalex.org/W2024873859

UR - https://www.scopus.com/pages/publications/28344432370

U2 - 10.1063/1.2108131

DO - 10.1063/1.2108131

M3 - Journal Article

SN - 0003-6951

VL - 87

SP - 1

EP - 3

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 16

M1 - 162506

ER -

Resistivity minima and Kondo effect in ferromagnetic GaMnAs films

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