Extreme Bedingungen, Materialentwicklung
A ferromagnetic transition at an extremely low temperature of only 0.15 K (−273°C) has been discovered in the compound YbNi4P2. The properties of this phase transition contradict current theoretical predictions and evidence the existence of a ferromagnetic quantum critical point (QCP). The existence of such a QCP has been a matter of discussion as long as 40 years ago, but had been dismissed in the past 15. The search for and the investigation of QCPs is not only a central subject of modern fundamental research, but is also relevant in the development of new technical applications.