News from the PQM Department

News at PQM

Teaser 1558081315

Tracking Structural Phase Transitions in Lead-Halide Perovskites by Means of Thermal Expansion

May 15, 2019
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]
Teaser 1557487232

Metamagnetic texture in a polar antiferromagnet

May 10, 2019
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]
Teaser 1550484896

Realization of a Tomonaga-Luttinger liquid in YbAlO3

February 18, 2019
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]
Teaser 1544521407

High pressure orders electrons

December 10, 2018
High-temperature superconductors can transport electrical energy without losses. However, a rigid charge order prevents superconductivity. In an international collaboration, researchers have studied the competing states with high-resolution inelastic X-ray scattering and found that high uniaxial pressure orders the electrons. Their study provides new insights into the function of electronically correlated materials. [more]
Teaser 1543239159

Humboldt Research Fellowship for Hilary Noad

November 26, 2018
Warmest congratulations to Dr Hilary Noad, who has been awarded a Humboldt Research Fellowship for Postdoctoral Researchers. [more]
Teaser 1541419418

Hanna Visiting Professorship for Andy Mackenzie

November 05, 2018
Professor Andy Mackenzie has been awarded a Hanna Visiting Professorship at Stanford University. [more]
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