- Tytuł:
- Fast Bolometric Response of Bulk La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ Electroceramic Structures
- Autorzy:
-
Nikolaenko, Yu. M.
Maksimov, I. S.
Medvedev, Yu. V.
Ulyanov, A. N.
Grishin, A. M. - Powiązania:
- https://bibliotekanauki.pl/articles/2014001.pdf
- Data publikacji:
- 2000-06
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
07.57.Kp
85.60.Gz
72.15.Gd - Opis:
- We report on the performance of a microwave electroceramic bolometer of hybrid La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$/Al$\text{}_{2}$O$\text{}_{3}$ (0.2×2×4 mm$\text{}^{3}$) structure. The estimated thermal resistance of the bulk ceramic manganite film-single crystal sapphire interface is about 500 K/W at room temperature. This resistance is the main thermal barrier in the heat sink system and has been found to be slightly dependent on temperature. When compared with the high-T$\text{}_{c}$ superconducting bolometers, the La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ microwave electroceramic bolometer works in a more wide temperature range, from 77 K to 330 K, excluding the narrow temperature interval at the metal-insulator phase transition (T=230 K). The microwave electroceramic bolometer sensitivity and the time constant at room temperature have been found to be 0.1 V/W and 100 ms, respectively. To improve the bolometer performance the point contact has been fabricated by a break junction technique. The optimization of a microwave electroceramic bolometer design brought to a considerable improvement of basic bolometer characteristics. The microwave sensitivity was about 0.3 V/W and the time constant was less than 100 ns.
- Źródło:
-
Acta Physica Polonica A; 2000, 97, 6; 991-995
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł