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Fast Bolometric Response of Bulk La_{0.7}Sr_{0.3}MnO_{3} Electroceramic Structures

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Nikolaenko Y., Maksimov I., Medvedev Y., Ulyanov A., Grishin A.

Acta Physica Polonica A

2000

vol. 97

issue 6

991-995

We report on the performance of a microwave electroceramic bolometer of hybrid La_{0.7}Sr_{0.3}MnO_{3}/Al_{2}O_{3} (0.2×2×4 mm^{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_{c} superconducting bolometers, the La_{0.7}Sr_{0.3}MnO_{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.

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1 Acta Physica Polonica A

1 2000

1 Grishin A.

1 Maksimov I.

1 Medvedev Y.

1 Nikolaenko Y.

1 Ulyanov A.

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Fast Bolometric Response of Bulk La_{0.7}Sr_{0.3}MnO_{3} Electroceramic Structures