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

• Authors: Yu. Nikolaenko , I. Maksimov , Yu. Medvedev , A. Ulyanov , A. Grishin
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

07.57.Kp; 85.60.Gz; 72.15.Gd

Discipline

• 07.57.Kp: Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors(see also 85.60.Gz Photodetectors in electronic and magnetic devices, and 95.55.Rg Photoconductors and bolometers in astronomy)
• 72.15.Gd: Galvanomagnetic and other magnetotransport effects(see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport)
• 85.60.Gz: Photodetectors (including infrared and CCD detectors)(for superconducting infrared detectors, see 85.25.Pb; for superconducting optical, x-ray and γ-ray detectors, see 85.25.Oj; see also 07.57.Kp in instruments)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2000
• Volume: 97
• Issue: 6
• Pages: 991-995

Dates

published

2000-06

received

1999-07-22

(unknown)

1999-12-10

Contributors

author

Yu. Nikolaenko

• Donetsk Physico-Technical Institute of the National Academy of Sciences of the Ukraine 72 R. Luxemburg, Donetsk, 340114, Ukraine

author

I. Maksimov

• Donetsk Physico-Technical Institute of the National Academy of Sciences of the Ukraine 72 R. Luxemburg, Donetsk, 340114, Ukraine

author

Yu. Medvedev

• Donetsk Physico-Technical Institute of the National Academy of Sciences of the Ukraine 72 R. Luxemburg, Donetsk, 340114, Ukraine

author

A. Ulyanov

• Donetsk Physico-Technical Institute of the National Academy of Sciences of the Ukraine 72 R. Luxemburg, Donetsk, 340114, Ukraine

author

A. Grishin

• Dept. of Condensed Matter Physics, Royal Institute of Technology 100 44, Stockholm, Sweden

Identifiers

DOI

10.12693/APhysPolA.97.991