Effect of temperature variation on shift and broadening of exciton band in Cs₃Bi₂I₉ layered crystals
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Effect of temperature variation on shift and broadening of exciton band in Cs₃Bi₂I₉ layered crystals
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| Creator |
Machulin, V.F.
Motsnyi, F.V. Peresh, E.Yu. Smolanka, O.M. Svechnikov, G.S. |
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| Subject |
Квантовые эффекты в полупpоводниках и диэлектриках
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| Description |
The exciton reflection spectra of Cs₃Bi₂I₉ layered crystals is investigated in the temperature region 4.2–300 K with light polarization E ⊥ c. It is estimated that the energy gap Eg equals 2.857 eV (T = 4.2 K) and the exciton binding energy Ry is 279 meV. A nontraditional temperature shift of Eg(T) for the layered substances is found for the first time. It is learned that this shift is described very well by the Varshni formula. A transition region in the temperature broadening of the half-width H(T) of the exciton band with the increase of temperature is registered in the interval between 150 and 220 K. It is shown that this region may be identified as the heterophase structure region where ferroelastic and paraelastic phases coexist. A surge of H(T) at the point of the ferroelastic phase transition (Tc = 220 K) is also observed. |
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| Date |
2017-06-12T06:29:41Z
2017-06-12T06:29:41Z 2004 |
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| Type |
Article
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| Identifier |
Effect of temperature variation on shift and broadening of exciton band in Cs₃Bi₂I₉ layered crystals / V.F. Machulin, F.V. Motsnyi, E.Yu. Peresh, O.M. Smolanka, G.S. Svechnikov // Физика низких температур. — 2004. — Т. 30, № 12. — С. 1283–1286. — Бібліогр.: 30 назв. — англ.
0132-6414 PACS: 64.70.Kb, 71.35.Cc, 78.40.Fy http://dspace.nbuv.gov.ua/handle/123456789/120368 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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