Anomalous High‐Temperature Superconductivity in YH ₆

Unconventional Superconductivity in Na X Coo 2 · Yh 2 O

We synthesized powder samples of NaxCoO2 · yH2O changing the volume of the water in the hydration process, then investigated their superconducting properties,. It was proved that the volume of water is one of key parameters to obtain a single phase of NaxCoO2 · yH2O with good superconducting properties. The transition temperature, Tc, of the sample changed gradually while it was stored in the a...

Anomalous superconductivity in coupled Luttinger liquids

According to Anderson ((A], pag. 54) "the equivalent of BCS theory for a fully spin-charge separated Luttinger liquid has not been formally worked out". We consider a model for two one dimensional spinning Luttinger liquids coupled via a Cooper tunnelling hamil-tonian. We show that the partition function is the four dimensional integral of an exponential whose exponent has an extremal point obt...

Water Content and Superconductivity in Na 0.3 Coo 2 · Yh 2 O

We report here the correlation between the water content and superconductivity in Na0.3CoO2 · yH2O under the influences of elevated temperature and cold compression. The x-ray diffraction of the sample annealed at elevated temperatures indicates that intergrowths exist in the compound at equilibrium when 0.6 < y < 1.4. Its low-temperature diamagnetization varies linearly with y, but is insensit...

Anomalous carrier density independent superconductivity in iron pnictides

Dome-shape superconductivity phase diagram can commonly be observed in cuprateand iron-based systems via tuning parameters such as charge carrier doping, pressure, bond angle, and etc. We report doping electrons from transition-metal elements (TM = Co, Ni) substitution can induce high-Tc superconductivity around 35 K in Ca0.94La0.06Fe2As2, which emerges abruptly before the total suppression of ...

Hightemperature hardness of Ga1x In x As