scholarly journals Synthesis of Carbon Showing Weak Antiferromagnetic Behavior at a Low Temperature

2019 ◽  
Vol 4 (1) ◽  
pp. 33 ◽  
Author(s):  
Masashi Otaki ◽  
Shota Hirokawa ◽  
Hiromasa Goto
Keyword(s):  
Low Temperature ◽  
Vapor Phase ◽  
Low Temperatures ◽  
Quantum Interference ◽  
Short Communication ◽  
Radical Cations ◽  
Superconducting Quantum Interference Device ◽  
Ullmann Reaction ◽  
Benzene Rings ◽  
Antiferromagnetic Behavior

In this short communication, we report a new carbon material prepared from meta-linked polyaniline that exhibits weak antiferromagnetic interactions at low temperature. The synthesis of poly(meta-aniline), abbreviated as m-PANI, was conducted using the Ullmann reaction with the aid of Cu+ as a catalyst in the presence of K2CO3. After the generation of radical cations by vapor-phase doping with iodine, carbonization was performed to prepare carbon polyaniline (C-PANI), which comprises condensed benzene rings. Analysis with a superconducting quantum interference device revealed that the resultant carbon exhibits antiferromagnetism at low temperatures. The discovery of this weak antiferromagnetic carbon may contribute to the development of carbon magnets.

Single superconducting quantum interference device multiplexer for arrays of low-temperature sensors

2001 ◽  
Vol 78 (3) ◽  
pp. 371-373 ◽  
Author(s):  
Jongsoo Yoon ◽  
John Clarke ◽  
J. M. Gildemeister ◽  
Adrian T. Lee ◽  
M. J. Myers ◽  
...  
Keyword(s):  
Low Temperature ◽  
Quantum Interference ◽  
Temperature Sensors ◽  
Superconducting Quantum Interference Device ◽  
Superconducting Quantum Interference

Mechanism of the Direct Photochemical Decomposition of Thietane and its Derivatives in the Vapor Phase, in Solution, and in Glassy Matrices

1975 ◽  
Vol 53 (12) ◽  
pp. 1744-1755 ◽  
Author(s):  
David R. Dice ◽  
Ronald P. Steer
Keyword(s):  
Low Temperature ◽  
Gas Phase ◽  
Vapor Phase ◽  
Low Temperatures ◽  
Condensed Media ◽  
Photochemical Decomposition ◽  
Glassy Matrices

The direct photolyses of thietane, 3-ethyl-2-propylthietane, and 3-methylthietane in the vapor phase, in solution, and in glassy matrices at low temperatures have been examined. The effects of varying the photolysis wavelength, the temperature, the pressure and the phase of the substrate, and of adding inert thermalizers on the nature and yields of the various products have been measured. The results are interpreted in terms of initial C—S cleavage to give a 1,4-biradical which may, in the gas phase, decompose or ring close before complete equilibration of the various rotamers is achieved, or which may be thermalized in condensed media and trapped in glassy matrices at low temperature.

ADVANCED HYBRID SQUID MULTIPLEXER CONCEPT FOR THE NEXT GENERATION OF ASTRONOMICAL INSTRUMENTS

2007 ◽  
Vol 16 (12b) ◽  
pp. 2407-2412
Author(s):  
I. HAHN ◽  
P. DAY ◽  
B. BUMBLE ◽  
H. G. LEDUC
Keyword(s):  
Low Temperature ◽  
Quantum Interference ◽  
Coaxial Cable ◽  
Low Temperature Detectors ◽  
Next Generation ◽  
Superconducting Quantum Interference Device ◽  
Detector Arrays ◽  
Prototype Development ◽  
Astronomical Instruments ◽  
Squid Multiplexer

The Superconducting Quantum Interference Device (SQUID) has been used and proposed often to read out low-temperature detectors for astronomical instruments. A multiplexed SQUID readout for currently envisioned astronomical detector arrays, which will have tens of thousands of pixels, is still challenging with the present technology. We present a new, advanced multiplexing concept and its prototype development that will allow for the readout of 1,000–10,000 detectors with only three pairs of wires and a single microwave coaxial cable.

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