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Magnetotransport in Zn 1− x Mn x Se:Cl under hydrostatic pressure
Author(s) -
Petznick Steve,
Hetterich Michael,
Klar Peter J.
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200505
Subject(s) - magnetoresistance , hydrostatic pressure , condensed matter physics , impurity , effective mass (spring–mass system) , zeeman effect , electrical resistivity and conductivity , metal–insulator transition , doping , materials science , chemistry , metal , magnetic field , physics , metallurgy , thermodynamics , organic chemistry , quantum mechanics
Pressure dependent magnetotransport measurements have been carried out on a chlorine‐doped Zn 0.98 Mn 0.02 Se epilayer with a carrier concentration below the critical concentration of the metal‐insulator transition (MIT). The large positive magnetoresistance at low temperatures can qualitatively be related to the giant Zeeman splitting of the donor states. The increase of the resistivity and the magnetoresistance effects under hydrostatic pressure is mainly related to the increase of the electron effective mass in the conduction band. This increase of the effective mass is the reason for an increase of the donor depth and a corresponding shrinkage of the donor wavefunction, which in turn leads to a narrowing of the impurity band (IB). The splitting of this narrow IB, which results from an applied pressure, is the main reason for the enhancement of the large positive magnetoresistance effects under pressure.