News at PQM

Lead-halide perovskite materials have a realistic perspective to play an important role in future photovoltaic devices. In our study, we have demonstrated that thermal expansion is a powerful technique to precisely determine phase transition temperatures. Since any structural change has severe impact on the phononic and electronic structure, the information provided by this study can be employed strategically to predict changes in the optical and charge transport properties that are currently under intense investigation. more

Ferromagnetism with parallel arrangement of magnetic moments and antiferromagnetism with an antiparallel one are two textbooks examples of magnetic orders. We report a discovery of a new type of magnetic order realized in Ca3Ru2O7 when a magnetic field is applied along a special direction in a crystal. A coupling between antiferromagnetic and ferromagnetic orders leads to a magnetic texture, which sways from parallel to antiparallel alignment of moments on lengthscales of a few tens of nanometers. more

An international research team from Germany, USA, China and Ukraine performed comprehensive spectroscopic and thermodynamic measurements of the new quasi-1D magnet, YbAlO3. Their study shows, that 4f-based magnets can provide an excellent realization of different aspects of quasi-1D quantum physics, such as quantum criticality and a Tomonaga-Luttinger liquid state. more

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