Vanadium oxide films for optical switching and detection

Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd2Os2O7

“…Therefore, we speculate that the MDWs generate ferromagnetic and metallic interface layers, which can give us persuasive explanations to various experimental results but needs to be examined by further experiments and theoretical considerations. Finally, we would like to point out striking similarities in properties between the two 5d pyrochlore oxides, Cd 2 Os 2 O 7 and R 2 Ir 2 O 7 (R represents one of rare earth elements other than La, Pr and Ce), 18,19 in spite of apparent difference in the basic electronic structures between Os 5+ (5d 3 ) and Ir 4+ (5d 5 ). For example, Nd 2 Ir 2 O 7 undergoes a MIT at 33 K, which seems to be accompanied by an AIAO magnetic order with a small ferromagnetic moment of ∼5 × 10 −3 µ B per Ir.…”

“…3,4 For example, the MIT of vanadium dioxide, VO 2 , at T MI = 340 K can be utilized as an infrared imaging device operating at room temperature in which absorbed infrared radiation changes the temperature of a microbolometer made of VO 2 with high sensitivity due to a large temperature coefficient of resistance at the transition. 5 Recently, an active control of the T MI has been achieved in thin films or beams by means of electric field or strain.…”

An analytic model employing an elliptical surface area to determine the gaseous thermal conductance of uncooled VOx microbolometers

“…The output of these sensors saturate and take a long time to recover. Furthermore, vanadium oxide is thermochromic, therefore its absorption and resistance properties change if the detector temperature exceeds about 68 • C as a semiconductor-metal phase transition occurs [16]. Devices operated at atmospheric pressure are better suited for high temperature operation due to the inclusion of an ambient or gaseous thermal conductance component of the microbolometer.…”

A Beamline for Time-Resolved Extreme Ultraviolet and Soft X-Ray Spectroscopy

“…Vision and light harvesting involve the transfer of light energy into chemical energy [1][2][3], the photoprotection of DNA and its components involves the selective transfer of light energy into heat instead of chemical change [4,5]. Materials that change their properties upon light illumination [6][7][8] as well as photovoltaic systems [9] promise major technological breakthroughs. The photoexcited state of matter is generally described by a complex concerted motion of electrons and nuclei on the timescale of femto-to picoseconds, whose understanding is still challenging [10] demanding extensive experimental studies.…”