Bal K. Pokharel

Abstract In a two-dimensional superconducting vortex lattice, the melting from the solid to the isotropic liquid can occur via an intermediate phase that retains orientational correlations. The effect of such correlations on transport and their interplay with the quenched disorder remain open questions. We perform magnetotransport measurements in a wide range of temperatures and magnetic fields on a weakly pinned two-dimensional vortex system in amorphous MoGe films.

Abstract We have investigated the normal state Fermi-surface properties of the kagome superconductor CsV3Sb5 using torque magnetometry with applied fields (H) up to 35 T. The torque signal shows clear de Haas–van Alphen (dHvA) oscillations above 15 T. The oscillations are smooth and consist of seven distinct frequencies with values from ∼ 18 T to 2135 T.