Band structure evolution and the origin of magnetism in (Ga,Mn) As: From paramagnetic through superparamagnetic to ferromagnetic phase

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Gluba, L.Polish Acad Sci, Poland;Maria Curie Sklodowska Univ Lublin, Poland,Maria Curie-Skłodowska University,Institute of Agrophysics, PAS (author)

Band structure evolution and the origin of magnetism in (Ga,Mn) As : From paramagnetic through superparamagnetic to ferromagnetic phase

The high-spectral-resolution optical studies of the energy gap evolution, supplemented with electronic, magnetic, and structural characterization, show that the modification of the GaAs valence band caused by Mn incorporation occurs already for a very low Mn content, much lower than that required to support ferromagnetic spin-spin coupling in (Ga,Mn) As. Only for n-type (Ga,Mn) As with the Mn content below about 0.3% the Mn-related extended states are visible as a feature detached from the valence-band edge and partly occupied with electrons. The combined magnetic and low-temperature photoreflectance studies presented here indicate that the paramagnetic <-> ferromagnetic transformation in p-type (Ga,Mn) As takes place without imposing changes of the unitary character of the valence band with the Fermi level located therein. The whole process is rooted in the nanoscale fluctuations of the local (hole) density of states and the formation of a superparamagnetic-like state. The Fermi level in (Ga,Mn) As is coarsened by the carrier concentration of the itinerant valence band holes and further fine-tuned by the many-body interactions.

Yastrubchak, O.Maria Curie Sklodowska Univ Lublin, Poland;Natl Acad Sci Ukraine, Ukraine,Maria Curie-Skłodowska University,V.E. Lashkaryov Institute of Semiconductor Physics (author)
Domagala, J. Z.Polish Acad Sci, Poland,Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences,Maria Curie-Skłodowska University (author)
Jakiela, R.Polish Acad Sci, Poland,Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences (author)
Andrearczyk, T.Polish Acad Sci, Poland,Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences (author)
Zuk, J.Maria Curie Sklodowska Univ Lublin, Poland (author)
Wosinski, T.Polish Acad Sci, Poland,Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences (author)
Sadowski, JanuszLinnaeus University,Lund University,Lunds universitet,Linnéuniversitetet,Institutionen för fysik och elektroteknik (IFE),Polish Acad Sci, Poland;Lund University, Sweden,MAX IV-laboratoriet,MAX IV Laboratory,Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences(Swepub:lu)maxl-jsa (author)
Sawicki, M.Polish Acad Sci, Poland,Institute - Center for Molecular and Macromolecular Studies of the Polish Academy of Sciences (author)
Polish Acad Sci, Poland;Maria Curie Sklodowska Univ Lublin, PolandMaria Curie-Skłodowska University (creator_code:org_t)

By the author/editor: Gluba, L.; Yastrubchak, O.; Domagala, J. Z.; Jakiela, R.; Andrearczyk, T.; Zuk, J.; show more...; Wosinski, T.; Sadowski, Janusz; Sawicki, M.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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