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Band structure evolution and the origin of magnetism in (Ga,Mn) As: From paramagnetic through superparamagnetic to ferromagnetic phase
Polish Acad Sci, Poland;Maria Curie Sklodowska Univ Lublin, Poland.
Maria Curie Sklodowska Univ Lublin, Poland;Natl Acad Sci Ukraine, Ukraine.
Polish Acad Sci, Poland.
Polish Acad Sci, Poland.
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 11, article id 115201Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 11, article id 115201
National Category
Physical Sciences
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:lnu:diva-72022DOI: 10.1103/PhysRevB.97.115201ISI: 000427311200003OAI: oai:DiVA.org:lnu-72022DiVA, id: diva2:1194238
Available from: 2018-03-29 Created: 2018-03-29 Last updated: 2018-05-17Bibliographically approved

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Sadowski, Janusz

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