Unusual paramagnetic centers in PbTe undoped crystals

Complex formation and background impurity of Oxygen in the PbTe:Eu doped crystals grown from melt by the Bridgman method

“…To carry out the analysis, it is necessary to know the form of the function f n ðTÞ in the ratio (16). In our previous work [27] we have shown that the PbTe:Eu crystals doped with Eu in the investigated range of impurity concentrations have the hole concentration about (2/3) Â 10 18 cm À 3 , i.e., practically the same as the undoped PbTe crystals grown from melt by the Bridgman method. Therefore, to estimate f n ðTÞ, we have investigated the high temperature M S w und of the four undoped p-PbTe samples with the hole concentration of about 2 Â 10 18 cm À 3 .…”

“…Therefore, the presence of the defects should lead to an increase of the Van Vleck paramagnetism of the lattice. The estimations of the paramagnetic constituents w p of the M S of the PbTe crystal matrix yield the value 12 Â 10 À 6 cm 3 /g [27]. Samples 2 and 6: these are the samples fabricated out of the same ingot.…”

Electron Paramagnetic Resonance Study of PbSe, PbTe, and PbTe:In Semiconductors Obtained by the Pulsed Laser Deposition Method

“…The natural occurrence of even Pb isotopes without a nuclear spin (I = 0) is 78.9%. EPR spectra for Pb ions have been observed in many works, (see, e.g., [37][38][39][40][41]). They are successfully described using a rhombic-symmetry spin Hamiltonian (1) with an electron spin S = 1/2 and nuclear spins I = 0 or 1 2 of the form (in the usual notation).…”