E. I. Terukov, P. P. Seregin, A. V. Marchenko, “Temperature dependence of the frequency of two-electron exchange between impurity negative-<nobr>$U$</nobr> tin centers in lead sulfide”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2014, Volume 40, Issue 5,Pages <nobr>22

Temperature dependence of the frequency of two-electron exchange between impurity negative-$U$ tin centers in lead sulfide

E. I. Terukov^abc, P. P. Seregin^abc, A. V. Marchenko^abc

^a Ioffe Institute, St. Petersburg
^b Saint Petersburg Electrotechnical University "LETI"
^c Herzen State Pedagogical University of Russia, St. Petersburg

Abstract: Fast two-electron exchange between neutral Sn$^{2+}$ and doubly ionized Sn$^{4+}$ impurity negative-$U$ tin centers in partially compensated Pb$_{0.98}$Sn$_{0.02}$Na$_{0.01}$Tl$_{0.01}$S solid solutions has been found by emission Mössbauer spectroscopy on $^{119mm}$Sn($^{119m}$Sn) isotope; the lifetime of the Sn$^{2+}$ and Sn$^{4+}$ states changes from $\sim$ 6 $\times$ 10$^{-4}$ to $\sim$ 8 $\times$ 10$^{-9}$ s with a change in temperature from 295 to 900 K.

Received: 28.10.2013