Temperature behavior of dielectric function spectra and optical transitions in TlGaS2

Shim Y., Kawabata T., Wakita K., MƏMMƏDOV N.

Physica Status Solidi (B) Basic Research, vol.252, no.6, pp.1254-1257, 2015 (SCI-Expanded, Scopus) identifier

  • Nəşrin Növü: Article / Article
  • Cild: 252 Say: 6
  • Nəşr tarixi: 2015
  • Doi nömrəsi: 10.1002/pssb.201400342
  • jurnalın adı: Physica Status Solidi (B) Basic Research
  • Jurnalın baxıldığı indekslər: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Səhifə sayı: pp.1254-1257
  • Açar sözlər: Dielectric function, Optical transitions, Structural phase transitions, Thallium compounds
  • Açıq Arxiv Kolleksiyası: Məqalə
  • Adres: Bəli

Qısa məlumat

The dielectric function spectra of TlGaS2 crystal with quasi-two-dimensional layered structure have been studied by means of spectroscopic elipsometry over the photon range 1.5-6.0eV in the temperature range 100-400K. The absolute values of the dielectric function show a sudden temperature-induced change around 180 and 280K. The energy of the inter-band optical transitions retrieved from the dielectric function spectra display an abrupt temperature change around the same temperatures. Structural phase transitions are behind the observed change of electronic band structure of TlGaS2.