Current problems at high Tc

DEVELOPMENT OF BEAM CURRENT MONITOR WITH HIGH-Tc SQUID AT RIBF

A highly sensitive beam current monitor with a highcritical-temperature (high-Tc) superconducting quantum interference device (SQUID) and a high-Tc current sensor, that is, a high-Tc SQUID monitor, has been developed for use in the radioisotope beam factory (RIBF) at RIKEN. As reported in the present work, the high-Tc SQUID monitor allows us to measure the DC of high-energy heavy-ion beams nond...

High Tc Superconducting Flux Flow Transistors : Potential Performances and Problems

Understanding High Tc Superconductivity ∗.

I briefly review several key issues in understanding the cuprate superconductors from the point of view of doped-Mott-insulator. Then I present an effective low-energy theory and show that the phase diagram of such a model includes an anti-ferromagnetic (AF) phase, a superconducting state, and a pseudogap phase at low doping and low temperature, consistent with the experimental one. The dual to...

Understanding High Tc Superconductivity ∗.

I briefly review several key issues in understanding the cuprate superconductors from the point of view of doped-Mott-insulator. Then I present an effective low-energy theory and show that the phase diagram of such a model includes an anti-ferromagnetic (AF) phase, a superconducting state, and a pseudogap phase at low doping and low temperature, consistent with the experimental one. The dual to...

Consilience of High-Tc Theories

Improvements both in the quality and in the variety of experiments on high-temperature superconductors have yielded new insights into the microscopic origins of pairing. A number of competing theories have already been ruled out. Some of the more promising descriptions – gauge theories, coupled-chains, nesting instabilities, nodal liquids, and stripes – share features in common. A unified pictu...