High-resolution Resonance Spin-flip Raman Spectroscopy of Pairs of Manganese Ions in CdTe

TL;DR

This study uses high-resolution resonance spin-flip Raman spectroscopy to analyze Mn ion pairs in CdTe quantum wells, revealing detailed exchange interactions and confirming known nearest-neighbor exchange constants.

Contribution

It provides precise experimental classification of Mn pair clusters and measures multiple exchange constants, enhancing understanding of magnetic interactions in diluted magnetic semiconductors.

Findings

Identified four characteristic energies corresponding to Mn pair clusters.

Measured exchange constants J_1=6.15 K, J_{(2)}=1.80 K, J_{(3)}=1.39 K, J_{(4)}=0.81 K.

Demonstrated high-resolution Raman spectroscopy's capacity to analyze magnetic interactions.

Abstract

We report the observation of tens of minor lines of the combinational spin-flip Raman scattering in a CdTe:Mn quantum well by means of the high-resolution optical spectroscopy. Classification of this manifold leads to four characteristic values of energy, that correspond to four different types of pair clusters of Mn ions: the nearest, second, third etc. neighbors. All the four energies show up in a single experiment with a very high precision, providing experimental grounds for a deeper understanding of the d-d exchange interactions in a diluted magnetic semiconductor and demonstrating the capacity of the employed method. The major (nearest-neighbor) exchange constant J_1 = 6.15 K was found to consent with its previously reported value. Other detected characteristic energies are as follows: J_{(2)} = 1.80 K, J_{(3)} = 1.39 K, J_{(4)} = 0.81 K.