FIR spectroscopy of Fe-based semimagnetic semiconductors

Submilimeter Magnetospectroscopy on ZnFeSe

“…1 we display resonant energies observed experimentally as a function of magnetic field. The previously observed [3,4] transitions Α1 -T1 and Α1 -Ε are clearly visible also for higher x, although the spectra are broader than those obtained for low x. The experimental energies match well the calculated energy level differences for isolated, i.e.…”

“…Α useful tool to study this structure is far infrared (FIR) spectroscopy [1,2]. Recently, an investigation of Fe-type SMSC has been reported [3,4], however it dealt with rather low Fe concentrations. In this paper we present complementary results of FIR 1aser spectroscopy for Ζn 1 -x Fex Se (x < 0.06) in the temperature range 2 < Τ < 26 K and magnetic fields up to 18 Τ.…”

Fe dopant in ZnO: 2+ versus 3+ valency and ion-carrier s,p−d exchange interaction

“…In particular, 2+ valency was reported for the iron ions in CdS, ZnS, CdSe, ZnSe, CdTe and ZnTe. [13][14][15][16][17][18][19][20] In the case of ZnO the Fe ions have been, however, observed in parallel in both valence states (2+ and 3+) [21][22][23][24][25] or exclusively in 3+ state.…”

Raman scattering in the diluted magnetic semiconductorZn1−xFexTe: A van Vleck paramagnet

“…The unique van Vleck paramagnetism of Fe 2+ , replacing the group II cations in the II-VI tetrahedrally coordinate DMSs, has been the focus of many experimental [10][11][12][13][14][15][16][17][18] and theoretical 6-9 studies. The electronic energy level scheme of Fe 2+ in the II-VI DMSs of either the zinc blende or the wurtzite symmetry displays a nonmagnetic ground state with magnetic excited levels separated by W lying above it.…”

“…Fe 2+ -based DMSs therefore display a magnetic susceptibility with signatures of the type first identified by van Vleck, 5 and such crystals are said to display van Vleck-type paramagnetism. They have been investigated theoretically [6][7][8][9] as well as experimentally, with magnetic susceptibility, 10 near and far infrared spectroscopies [11][12][13] and Raman spectroscopy. [14][15][16][17][18] In the present paper, we report the Zeeman effect of the Raman transition in Zn 1−x Fe x Te from the ⌫ 1 ground state to the ⌫ 4 , the first excited state of the internal levels of Fe 2+ , as a function of magnetic field B and crystallographic orientation.…”