Spin-glass-like behavior of Ge:Mn

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JAEGER, Christian, Christoph BIHLER, Thomas VALLAITIS, Sebastian T. B. GÖNNENWEIN, Matthias OPEL, Rudolf GROSS, Martin S. BRANDT, 2006. Spin-glass-like behavior of Ge:Mn. In: Physical Review B. American Physical Society (APS). 74(4), 045330. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.74.045330

@article{Jaeger2006-04-03T11:55:10ZSping-52597, title={Spin-glass-like behavior of Ge:Mn}, year={2006}, doi={10.1103/PhysRevB.74.045330}, number={4}, volume={74}, issn={2469-9950}, journal={Physical Review B}, author={Jaeger, Christian and Bihler, Christoph and Vallaitis, Thomas and Gönnenwein, Sebastian T. B. and Opel, Matthias and Gross, Rudolf and Brandt, Martin S.}, note={Article Number: 045330} }

Vallaitis, Thomas Brandt, Martin S. Gönnenwein, Sebastian T. B. Gönnenwein, Sebastian T. B. terms-of-use We present a detailed study of the magnetic properties of low-temperature molecular-beam-epitaxy-grown Ge:Mn dilute magnetic semiconductor films. We find strong indications for a frozen state of Ge<sub>1−x</sub>Mn<sub>x</sub>, with freezing temperatures of T<sub>f</sub>=12K and T<sub>f</sub>=15K for samples with x=0.04 and x=0.2, respectively, determined from the difference between field-cooled and zero-field-cooled magnetization. For Ge<sub>0.96</sub>Mn<sub>0.04</sub>, ac susceptibility measurements show a peak around T<sub>f</sub>, with the peak position T<sup>′</sup><sub>f</sub> shifting as a function of the driving frequency f by ΔT<sup>′</sup><sub>f</sub>/[T<sup>′</sup><sub>f</sub>Δlogf]≈0.06, whereas for sample Ge<sub>0.8</sub>Mn<sub>0.2</sub> a more complicated behavior is observed. Furthermore, both samples exhibit relaxation effects of the magnetization after switching the magnitude of the external magnetic field below T<sub>f</sub> which are in qualitative agreement with the field- and zero-field-cooled magnetization measurements. These findings consistently show that Ge:Mn exhibits a frozen magnetic state at low temperatures and that it is not a conventional ferromagnet. 2021-01-28T12:29:03Z Gross, Rudolf Bihler, Christoph 2006-04-03T11:55:10Z eng Spin-glass-like behavior of Ge:Mn Opel, Matthias 2021-01-28T12:29:03Z Brandt, Martin S. Gross, Rudolf Opel, Matthias Jaeger, Christian Jaeger, Christian Bihler, Christoph Vallaitis, Thomas

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