Physics – Condensed Matter – Materials Science
Scientific paper
2005-09-05
Phys. Rev. B 72, 165203 (2005)
Physics
Condensed Matter
Materials Science
16 pages, 6 figures. To be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.72.165203
Electronic transport and magnetic properties of Ge1-xMnx/Ge(100) films are investigated as a function of Mn dilution. Depending on x, characteristic temperatures separate different regimes in both properties. Resistivity exhibits an insulator-like behavior in the whole temperature range and, below about 80 K, two distinct activation energies are observed. At a higher temperature value, TR, resistivity experiences a sudden reduction. Hall coefficient shows a strong contribution from the anomalous Hall effect and, at TR, a sign inversion, from positive to negative, is recorded. The magnetic properties, inferred from magneto-optical Kerr effect, evidence a progressive decrease of the ferromagnetic long range order as the temperature is raised, with a Curie temperature TC not far from TR. The transport and magnetic results are qualitatively consistent with a percolation mechanism due to bound magnetic polarons in a GeMn diluted magnetic semiconductor, with localized holes [A. Kaminski and S. Das Sarma, Phys. Rev. B 68, 235210 (2003)].
Amato Gianluca
Boarino L.
D'Orazio F.
Ficcadenti M.
Lucari F.
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