Alex Eaton, University of Cambridge, UK and Yurii Skourski, HLD. Scientists from the UK, USA, Czech Republic, and Germany have studied the Fermi surface of the heavy-fermion superconductor UTe2. This material is of particular interest given its high likelihood of hosting a spin-triplet Cooper-pairing mechanism. Evidence for this stems primarily [...]
Tristan Thebault, William Knafo, LNCMI Toulouse, Daniel Braithwaite, Gérard Lapertot, Georg Knebel, CEA-Grenoble, and Dai Aoki, Tohoku University. The interplay between magnetism and unconventional superconductivity in UTe2 was extensively studied in the past few years. Multiple superconducting phases were found to be induced near to a metamagnetic transition under magnetic [...]
Y. Tokunaga, Japan Atomic Energy Agency, Tokai, Japan, M. Horvatić and Steffen Krämer, LNCMI Grenoble. The uranium-based superconductor UTe2 provides an attractive platform for studying the novel physics of spin-triplet and topological superconductivity in bulk materials. Resistivity measurements performed in 2019 at LNCMI, both in continuous and pulsed fields, revealed that [...]
Maurice Bal, HFML Nijmegen. Since its discovery in 1980 by von Klitzing et al., the quantum Hall effect (QHE) has been measured in many different 2D systems, mainly at cryogenic temperatures. Currently, graphene is the only material that displays the QHE at room temperature (RT). Considering that the robustness of [...]
Toni Helm, HLD. The recent discovery of superconductivity (SC) in the heavy-fermion metal UTe2 with a critical temperature of about 2 K triggered much excitement, as its critical field reaches values approaching those of high-Tc superconductors. Moreover, UTe2 appeared very quickly as a potential candidate for topological spin-triplet SC that [...]
Z. Yang, Y. Kohama, ISSP, University of Tokyo, Japan and D. K. Maude, LNCMI Toulouse. We have investigated quantum oscillations in the electronic specific heat, Cel, in natural graphite. The crossing of a single spin Landau level at the Fermi energy gives rise to a double-peak structure (Figure 1a). Crucially, [...]
Adrien Rosuel, Christophe Marcenat, Georg Knebel, Jean-Pascal Brison, Phéliqs Grenoble, Thierry Klein, Institut Néel, Grenoble, Dai Aoki, Tohoku University, Albin Demuer, and Gabriel Seyfarth, LNCMI-Grenoble. The discovery that superconductivity can also be induced by direct interactions between electrons, for example mediated by their magnetic properties, was a real breakthrough. However, [...]
Sandra Kleuskens, HFML Nijmegen and IMM Radboud, Daniela Wilson, IMM Radboud, and Hans Engelkamp, HFML Nijmegen. Researchers of HFML-FELIX and the Radboud University have determined the magnetic anisotropy of polystyrene in poly-ethyleneglycol polystyrene polymersomes by magnetic birefringence and transmission electron microscopy. The magnetic anisotropy found is only a small fraction [...]
Tommy Kotte, HLD. The conventional classification of magnetic materials has long been based on their distinction as either ferromagnetic or antiferromagnetic, determined by the presence or absence of a discernible net magnetic moment. In the ferromagnetic state, the break of timereversal symmetry, coupled with spontaneous spin polarization in the electronic [...]
Simon Tardieu, Florence Lecouturier-Dupouy, LNCMI Toulouse, and Christophe Laurent, Université de Toulouse. The generation of record pulsed magnetic fields above 100 T requires the use of coils wound with low-resistivity wires in order to limit the heating, and with a very high mechanical strength in order to be able to [...]