Exchange-Induced Spin-Flip Raman Scattering in a Semimagnetic Semiconductor

Abstract

A magnetic-field-and temperature-dependent line is observed in the Raman spectra of a w-type semimagnetic semiconductor: Cd 0#95 Mn 0#05 Se. It is attributed to spin-flip Raman scattering, with "giant" Stokes shift: 75 cm" 1 in 1 T at 1.6 K. A small zerofield Stokes shift is observed, which is attributed to an exchange-induced magnetic molecule under the electronic orbit of neutral donors.

Evaluation of evidence for magnetic polarons inEuB6

“…Experimental evidence included photoluminescence spectra [24] and magneto-optical experiments as Spin Flip Raman Scattering [17,25,26]. The Raman scattering spectrum shows an inelastic peak at low frequencies (Stokes' shift) which, for the diluted magnetic semiconductors, depends as follows on polaronic properties: [16] ∆E =xJ…”

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

“…21 In addition, SFRS produces signatures narrower than those in unmodulated magnetoreflectivity, 23,[31][32][33] allowing N 0 ␣ to be determined with a higher precision in the former than in the latter. SFRS also shows the occurrence of a bound magnetic polaron in Mn-based DMSs [34][35][36][37][38] as well as in van Vleck paramagnets. 15,22 In this section, we report the experimental results of SFRS in Zn 1−x Fe x Te and N 0 ␣ deduced from the combination of SFRS shifts with the magnetization measurements.…”

From Magnetic Polarons to Ferromagnetism

“…This observation stimulated a number of detailed experimental works, from which particularly rewarding were studies of donor states by Rainan spectroscopy [6][7][8][9][10][11]. This is so because the cross-section for spin-flip Raman scattering (SFRS) is directly proportional to the spin-spin correlation function of the donor electron, a quantity which could be analytically calculated, even with the effect of thermodynamic fluctuations of magnetization taken into account [12,13].…”