Fermi Level Position in GaMnAs - a Thermoelectric Study

• Authors: V. Osinniy , A. Jędrzejczak , M. Arciszewska , W. Dobrowolski , T. Story , J. Sadowski
• Languages of publication: EN

Abstracts

EN

Thermoelectric power was studied in the temperature range 100≤ T≤300 K in 0.3-1μm thick ferromagnetic Ga_{1-x}Mn_xAs epitaxial layers (0.015≤ x≤0.06) in order to determine Fermi energy E_F and carrier concentration p. For 0.015≤ x≤0.05, at T=273 K we find E_F=275±50 meV and p=(2.5± 0.5)×10^{20} cm^{-3} (approximately Mn content independent). For x= 0.06, the Fermi energy decreases by about 100 meV with the corresponding reduction of hole concentration to p=1.2×10^{20} cm^{-3}. At T=120 K, these parameters vary between E_F=380 meV and p=3.5×10^{20} cm^{-3} for x=0.015 to E_F=110 meV and p=5×10^{19} cm^{-3} for x=0.06.

Keywords

EN

75.20.Ck; 75.30.Et; 73.50.-h

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 73.50.-h: Electronic transport phenomena in thin films(for electronic transport in mesoscopic systems, see 73.23.-b; see also 73.40.-c Electronic transport in interface structures; for electronic transport in nanoscale materials and structures, see 73.63.-b)
• 75.20.Ck: Nonmetals

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: 3
• Pages: 327-334

Dates

published

2001-09

received

2001-06-01

Contributors

author

V. Osinniy

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

author

A. Jędrzejczak

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

author

M. Arciszewska

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

author

W. Dobrowolski

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

author

T. Story

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

author

J. Sadowski

• MAX-lab, Lund University, 22100 Lund, Sweden
• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.100.327