HIGH-FIELD CHARGE ORDER ACROSS THE PHASE DIAGRAM OF YBCO
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 [...]
GATE-TUNING ACROSS THE SUPERCONDUCTING DOME OF MONOLAYER WS2
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 [...]
HOW CHARGE ORDER WEAKENS SUPERCONDUCTIVITY IN YBa2Cu3Oy
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, [...]
A MULTICALORIC COOLING CYCLE THAT EXPLOITS THERMAL HYSTERESIS
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, [...]
STRONG INTERACTION EFFECTS IN MoS2 LANDAU LEVELS
Jiangxiazi Lin, Ning Wang, Hong Kong University of Science and Technology and Benjamin Piot, LNCMI-Grenoble. Semiconducting two-dimensional transition-metal dichalcogenides (TMDCs) have been a recent hot research topic in physics, for their novel optical/electronic properties and potential applications.
A DROSOPHILA FOR WEYL PHYSICS: GdPtBi
C. Shekhar, MPI CPfS Dresden and Y. Skourski, HLD Dresden. In 1929, Hermann Weyl discovered that massless spin-1/2 particles are solutions of the Dirac equation. After many decades, these Weyl particles were finally experimentally revealed in 2015 in simple semimetallic materials such as TaAs. Weyl fermions are low-energy quasiparticle excitations in the vicinity of the unavoidable touching points of a valence band and a conduction band: these materials are “Weyl semimetals”.
ELECTRON-HOLE TUNNELING IN MOMENTUM SPACE REVEALED BY QUANTUM OSCILLATIONS
M. van Delft, S. Pezzini, T. Khouri, C. Müller, N. Hussey, S. Wiedmann, HFML Nijmegen. Researchers from Germany, USA, UK, and the HFML Nijmegen have found evidence for electron-hole tunneling in momentum space in the nodal-line semimetal HfSiS. This specific tunneling phenomenon is revealed in quantum oscillations of the electrical resistance at low temperatures and in high magnetic fields, and can be illustrated as a ‘figure-of-eight orbit’ enclosing one electron and one hole pocket.
PLANCKIAN DISSIPATION IN HIGH-TC SUPERCONDUCTORS
Cyril Proust, LNCMI-Toulouse and Louis Taillefer, University of Sherbrooke. Measuring the electrical resistance of a new material is often the first experiment that researchers do, but also often the last to be understood. Nevertheless, the temperature dependence of the electrical resistance gives essential information on the ground state of materials.
Electronic phases in high magnetic fields
Electrons are one of the fundamental constituents of solids, responsible for most of the important phenomena and applications in condensed matter physics. Therefore, understanding, controlling and manipulating electronic properties is still one of the great challenges of condensed matter [...]
High magnetic fields for fundamental physics
Following the HIMAFUN workshop held in may 2017 in Toulouse, a review article has been published on Physics Report freely availaible here or DOI