Su-Di Chen

Editor’s summary Copper oxide materials can be made superconducting by doping the parent compound with either electrons or holes. Hole-doped cuprates typically have higher transition temperatures and have been studied more extensively. Xu et al. used photoemission measurements to investigate the phase diagram of the electron-doped cuprate Nd2-xCexCuO4. An unusual energy gap was observed to develop high above the temperature of the superconducting transition.

Abstract Microwave impedance microscopy (MIM) is an emerging scanning probe technique for nanoscale complex permittivity mapping and has made significant impacts in diverse fields. To date, the most significant hurdles that limit its widespread use are the requirements of specialized microwave probes and high-precision cancellation circuits. Here, we show that forgoing both elements not only is feasible but also enhances performance.