The structure which consists in particular of hydrogen, fluorine, carbon and copper, has been realized in an entirely novel, three-dimensional and very stable form. This will be described in an upcoming issue of the journal "Chemical Communications".
Magnetism is a physical property of matter related to the magnetic spins of electrons. Iron, for example, is a ferromagnet because these spins are aligned parallel to each other, generating a uniform magnetic field. Antiferromagnetism, on the other hand, arises when neighboring spins are oriented antiparallel to each other.
Such antiferromagnetism has been shown to exist for the new polymeric compound studied at the Forschungszentrum Dresden-Rossendorf (FZD). This polymer is characterized by a novel and unusual structure where copper atoms together with pyrazin-molecules build layers, which in turn through bridges of hydrogen and fluorine are connected with each other. The three-dimensional polymer was prepared by chemists working with Jamie Manson at Eastern Washington University and was subsequently studied by physics teams in Great Britain and in the research center in Dresden-Rossendorf.
Metallic copper is not magnetic. Joachim Wosnitza and his colleagues at the Dresden High Magnetic Field Laboratory discovered at a temperature of 1.54 Kelvin – that is 1.54 degrees above absolute zero at -273.15 °C – that the embedded copper atoms order themselves antiferromagnetically. In the compound, every copper ion possesses a magnetic spin which interacts with neighboring spins through organic units. How this interaction arises and how it can be influenced is presently under investigation.
Additional polymeric samples from the laboratory of Manson will be studied at the Forschungszentrum Dresden-Rossendorf with the objective of a better understanding of the newly discovered magnetism for this class of polymers. In the future, this would be a significant step, to synthesize organic materials with tailored magnetic properties. Permanent magnets can be made from iron and other ferromagnetic materials, from polymers this is, according to the current knowledge, not possible. The great vision of the scientists is to realize ferromagnetic properties for novel polymeric compounds that eventually would permit the development of innovative magnets.
Christine Bohnet | alfa
Significantly more productivity in USP lasers
06.12.2016 | Fraunhofer-Institut für Lasertechnik ILT
Shape matters when light meets atom
05.12.2016 | Centre for Quantum Technologies at the National University of Singapore
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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