Features of the electrical-conductivity mechanism in $\gamma$-irradiated TlInSe$_{2}$ single crystals under hydrostatic pressure

The effect of hydrostatic pressure to 10 kbar on the conductivity of $\gamma$-irradiated chain TlInSe$_2$ single crystals with a resistivity of $\sim$10$^8$ $\Omega$ cm is studied. It is found that the observed conductivity anomalies of TlInSe$_2$ samples irradiated at doses of $D<$ 100 krad and $D>$ 100 krad are associated with the ordered transformation of defects including interstitial cations and anions. The nature of the anomalous change and pressure dependences of the resistivity $\sigma(P)$ in the irradiated samples suggest that pressure causes local energy levels due to macroscopic clusters of radiation-induced defects, with the result that the Fermi-level energy and carrier concentration change.