Nigel Hussey, HFML and Anthony Carrington, University of Bristol. Researchers from the UK and Japan, together with scientists from three of the EMFL laboratories, have uncovered a striking crossover in the Hall resistivity across the so-called strange-metal phase of overdoped cuprate superconductors [1]. The work builds on a seminal work [...]

Sanu Mishra and Ilya Sheikin, LNCMI Grenoble, Tobias Förster, HLD Dresden, and Alix McCollam, HFML Nijmegen. Rare-earth-based materials are now widely recognized as an ideal playground for exploration of the fascinating physics that develops around a quantum critical point (QCP). In Ce-based compounds, such a QCP typically separates an antiferromagnetic [...]

Toni Helm, HLD Dresden. Strongly correlated electron materials, in particular heavy-fermion compounds, offer a huge playground for research on fundamental concepts in condensed-matter physics. The antiferromagnetic (AFM) metal CeRhIn5 provides a textbook example of quantum criticality in a heavy-fermion system: Pressure suppresses local-moment AFM order and induces superconductivity in a [...]

David Leboeuf and Marc-Henri Julien, LNCMI-Grenoble. Extensive studies of cuprate superconductors have shown that, after three-dimensional Néel order disappears upon hole doping (p), there are still remnants of spin order at low temperature in the form of a glass-like freezing of incommensurate antiferromagnetic correlations. However, the importance of the [...]

Uli Zeitler, HFML Nijmegen. The fractional quantum Hall effect (FQHE), observed in low-temperature magnetotransport experiments in two-dimensional (2D) electron systems and caused by the electron-electron interaction, can be regarded as an ultimate proof of device quality in terms of quantum mobility, homogeneity, and low residual impurities. Until recently, the observation [...]