Steffen Wiedmann, HFML Nijmegen. In 2017 and 2018, two PhD students from Brazil came to Nijmegen to do a part of their post-graduate program at the EMFL facility in Nijmegen. They obtained a one-year PhD fellowship from the Federal Agency for Support and Evaluation of Graduate Education (CAPES). Thanks to [...]
Sergei Zvyagin, HLD Dresden. Spin-1/2 triangular-lattice Heisenberg antiferromagnets represent one of the most important classes of frustrated quantum magnets, demonstrating a complex interplay between geometrical frustration, quantum fluctuations, and magnetic order. In spite of their simple magnetic structures (Figure, inset), they possess highly unusual magnetic properties and a very [...]
Yo Tokunaga, JAEA Tokai, Nicolas Bruyant, LNCMI-Toulouse, and Ilya Sheikin, LNCMI-Grenoble. Heavy-fermion materials exhibit a diverse range of fascinating phenomena including quantum phase transition (QPTs), non-Fermiliquid behavior, and novel states of matter such as unconventional superconductivity. The application of high magnetic fields often induces additional phase transitions, such as [...]
Sergio Pezzini, Steffen Wiedmann, Uli Zeitler, HFML Nijmegen. Two-dimensional layers of graphene and hexagonal boron nitride (hBN) both have a honeycomb atomic structure, with a slight lattice mismatch of 1.8 %. When placing graphene on top of hBN one forms a so-called moiré pattern, with a large periodicity of [...]
Leah Weiss, Sam Bayliss, University of Cambridge and Paulina Plochochka, LNCMI-Toulouse. Intermolecular coupling plays a key role in charge transport and excited-state dynamics in organic systems. A key example of the influence of intermolecular interactions is the process of singlet fission, which involves the production of two triplet excitons [...]
Zhe Wang, HZDR Dresden and A. Loidl, University of Augsburg. In his seminal work entitled “Eigenwerte und Eigenfunktionen der linearen Atomkette” (eigenvalues and eigenfunctions of a linear chain of atoms), published in 1931 in “Zeitschrift für Physik”, Hans Bethe succeeded in finding an exact solution to the one dimensional [...]
F. Laliberté, M. Frachet, S. Benhabib, B. Borgnic, C. Proust, D. LeBoeuf, LNCMI-Toulouse. In hole-doped cuprates there is now compelling evidence that inside the pseudogap phase, a charge density wave (CDW) breaks translational symmetry. In YBa2Cu3Oy (YBCO) this CDW emerges in two steps: a two-dimensional (2D) order found at [...]
J. Lu, Peking University and J. Ye, University of Groningen and I. Leermakers, N. Hussey, U. Zeitler, HFML-Nijmegen. Compared with three-dimensional superconductors, atomically thin superconductors are expected to be easier to engineer for electronic applications. In this project, researchers from University of Groningen (Netherlands) together with colleagues from HFML [...]
Marc-Henri Julien, LNCMI Grenoble. The upper critical field, Hc2, is a fundamental, and technologically important property that measures the ability of a superconductor to withstand magnetic fields. Recently, there has been a controversy regarding Hc2 values in high-Tc copper-oxides, particularly in the context of the competition between superconductivity and [...]
T. Gottschall, HLD Dresden. The giant magnetocaloric effect, in which large thermal changes are induced in a material on the application of a magnetic field, can be used for refrigeration applications. However, commercial uptake is limited. Researchers from Barcelona, Darmstadt, and the HLD proposed an approach to magnetic cooling [...]