Magnetic properties of Ce³⁺in PbCeA (A= Te, Se, S)

Abstract

Abstract. The magnetic susceptibility of Pb 1-x Ce x A (A = S, Se and Te) crystals with 0.006 ≤ x ≤ 0.036 were studied in the temperature range from 20 mK up to room temperature. X-band (~9.5 GHz) Electron Paramagnetic Resonance (EPR) showed small shifts in the effective Landé factors that were attributed to crystal-field admixture. The EPR measurements were correlated with the magnetic susceptibility data and resulted in estimating the crystal-field splitting E( 8 ) -E( 7 ) of the lowest 2 F 5/2 manifold for Ce 3+ ions in PbA (A = S, Se and Te) of about 340 K, 440 K and 540 K for Pb 1-x Ce x Te, Pb 1-x Ce x Se, and Pb 1-x Ce x S, respectively. The values for the crystal-field splitting deduced from the magnetic data were found to be in agreement with the calculated ones based on the point charge model. Moreover, the deHaas van-Alphen magnetic oscillations in the susceptibility measurements of Pb 1-x Ce x Te (x~ 0.05 and 0.07) were observed at ultra-low temperature (20 mK); The oscillations were investigated and the values of the oscillatory period for Pb 1-x Ce x Te (x = 0.0048 and 0.007) are reported.

Untypical tuneable emission activated by NIR radiation observed in gadolinium borate nanomaterials doped with Yb 3+ , Ho 3+ and Ce 3+ ions

“…The photoluminescence of Ce 3+ in various inorganic phosphors is extensively studied, but no research is found related to the GdBO 3 :Yb 3+ , Ho 3+ , Ce 3+ materials 10,33,34 . The ground state of Ce 3+ is a doublet 35 , and the lower excited states are associated with the 5d con guration. Owing to the doublet characteristics of the 4f, the emission from the ground state of Ce 3+ exhibits two overlapping bands 36 .…”

²F_5/2 Manifold Splitting of Ce³⁺ in PbCeX (X= Te, Se, S): A Magnetic Susceptibility Study

“…Diluted magnetic semiconductors (DMS) generally consist of a magnetic semiconducting material, such as II-VI or IV-VI, in which a small fraction of cations is replaced by magnetic rare-earth or transition metal ions [1][2][3][4][5][6][7][8][9]. The magnetic properties of IV-VI diluted magnetic semiconductors (DMS) containing rare earth ions with S (L = 0) state have been extensively investigated [10,11]. However, the study of IV-VI DMS containing a fraction of non Sstate rare-earth ions is much less explored [11,12].…”