High Tc Superconducting Transistor.

Applications using high-Tc superconducting terahertz emitters

Using recently-developed THz emitters constructed from single crystals of the high-Tc superconductor Bi2Sr2CaCu2O8+δ, we performed three prototype tests of the devices to demonstrate their unique characteristic properties for various practical applications. The first is a compact and simple transmission type of THz imaging system using a Stirling cryocooler. The second is a high-resolution Mich...

High Tc Superconducting Flux Flow Transistors : Potential Performances and Problems

Modeling of superconducting stripe phases in high-Tc cuprates

Even before the experimental discovery of spinand charge-stripe order in La2−x−yNdySrxCuO4 and La2−xBaxCuO4 at x = 1/8, stripe formation was predicted from theoretical considerations. Nevertheless, a consistent description of the complex coexistence of stripe order with superconductivity has remained a challenge. Here we introduce a Hartree–Fock decoupling scheme that unifies previous approache...

Thermodynamic desorption of oxygen in high Tc superconducting oxides

We measure as a function of temperature and composition the equilibrium pressure of desorbed oxygen from superconducting oxides MBa2 Cu3 O6+x (M=Eu, Y). Using the Lacher model we determine the enthalphy of formation of the excess oxygen x (-0.7 eV/atom) as well as the repulsive O-O interaction energy (0.11eV). We also observe that there is a spontaneous reabsorption of the oxygen above about 60...

Microwave Intermodulation in High-Tc Superconducting Microstrip Resonators

|We present experimental results on microwave intermodulation measurements on a High Tc Superconducting band-reject microstrip resonator which exhibits unconventional 2:1 intermodulation products. We discuss unusual features of this 2:1 behavior that are uncovered by detailed frequency swept and unbalanced power measurements. We also introduce a phenomenological theory which arises from a nonli...