Dielectric spectroscopy and nonequilibrium phase transitions in TlGaSe 2 layered crystals

Ferid Salehli*, Yakup Baki, Mirhasan Yu Seyidov, Rauf A. Suleymanov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The real and imaginary parts of the dielectric function of TlGaSe 2 single crystals are investigated in the frequency range 30 Hz-13 MHz and at temperatures 80 K-300 K. A low frequency dispersion due to the interfacial polarization within the crystals is observed. The temperature dependence of relaxation time is obtained in a wide temperature region. A well- distinguished anomalous rise of relaxation time has been established in the 145 K-190 K temperature range for the first time far from the traditional phase transitions known in TlGaSe2 crystals. It is shown that the observed behaviour of relaxation time is due to instabilities in the electronic subsystem revealing themselves as a non-equilibrium phase transition. A close relationship between the observed anomaly and anomalous behaviour of the various physical parameters of the investigated crystals is proposed.

Original languageEnglish
Article number002
Pages (from-to)843-850
Number of pages8
JournalSemiconductor Science and Technology
Issue number8
Publication statusPublished - 1 Aug 2007


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