Upper bound for the s-d exchange integral in n-(Ga,Mn)N:Si from magnetotransport studies

Abstract

A series of recent magnetooptical studies pointed to contradicting values of the s-d exchange energy N0α in Mn-doped GaAs and GaN as well as in Fe-doped GaN. Here, a strong sensitivity of weak-localization phenomena to symmetry breaking perturbations (such as spin-splitting and spin-disorder scattering) is exploited to evaluate the magnitude of N0α for n-type wurtzite (Ga,Mn)N:Si films grown by metalorganic vapor phase epitaxy. Millikelvin magnetoresistance studies and their quantitative interpretation point to N0α < 40 meV, a value at least 5 times smaller than the one found with similar measurements on, e.g., $n$-(Zn,Mn)O. It is shown that this striking difference in the values of the s-d coupling between $n$-type III-V and II-VI dilute magnetic semiconductors can be explained by a theory that takes into account the acceptor character of Mn in III-V compounds.

5 pages, 5 figures

References in corpus (8)

• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Origin of ferromagnetism in (Zn,Co)O from magnetization and spin-dependent magnetoresistance
• Interplay between carrier localization and magnetism in diluted magnetic and ferromagnetic semiconductors
• Observation of strong-coupling effects in a diluted magnetic semiconductor (Ga,Fe)N
• Suppression of electron spin relaxation in Mn-doped GaAs
• Confinement engineering of s-d exchange interactions in GaMnAs quantum wells
• Electron-hole contribution to the apparent s-d exchange interaction in III-V diluted magnetic semiconductors
• Excitonic giant Zeeman effect in GaN:Mn^3+

Cited by in corpus (4)

• Electrical characteristics of vertical-geometry Schottky junction to magnetic insulator (Ga,Mn)N heteroepitaxially grown on sapphire
• Raman scattering studies of the lateral Mn distribution in MBE-grown Ga1-xMnxN epilayers
• Spin Hall magnetoresistance in Pt/(Ga,Mn)N devices
• From narrow-gap and semimagnetic semiconductors to spintronics and topological matter: a life with spins