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 ...

130 LLE Review, Volume 91 The recent discovery of superconductivity at 39 K in hexagonal magnesium diborides1 has stimulated very intensive investigations of the fundamental mechanism of superconductivity in MgB2 as well as the possible practical applications of this new superconductor. In comparison with high-temperature cuprates, MgB2 superconductors have more than two-timeslower anisotropy, ...

The aim of the paper was to show if the acoustic emission (AE) signals from BiSrCaCuO ceramic superconductors appear during normal state–superconductivity transition. These AE signals were previously observed from YBaCuOtype superconducting materials. The BiSrCaCuO samples were prepared and characterised. The resistance–temperature and current–voltage characteristics of these samples were measu...

Quantum-mechanical fluctuations in strongly correlated electron systems cause unconventional phenomena such as non-Fermi liquid behavior, and arguably high temperature superconductivity. Here we report the discovery of a field-tuned quantum critical phenomenon in stoichiometric CeCu(2)Ge(2), a spin density wave ordered heavy fermion metal that exhibits unconventional superconductivity under ≃10...

2014 Under the proper circumstances a current carrying superconductor can generate voltage. This voltage is produced by supercurrent oscillations at frequency 03C9 = 2e/0127 V 2014 a phenomena similar to the Josephson effect in superconducting tunnel junctions. Various structures have been fabricated in which this quantum relation dominates the electrical behavior. These thin film structures ha...

The effects of spin-polarized quasiparticle transport in superconducting YBa2Cu3O7−δ (YBCO) epitaxial films are investigated by means of current injection into perovskite ferromagnet-insulatorsuperconductor (F-I-S) heterostructures. These effects are compared with the injection of simple quasiparticles into control samples of perovskite non-magnetic metal-insulator-superconductor (N-IS). System...

The Imperial College group has a long-established programme on superconductivity, going back to before the discovery of the high temperature superconductors (HTS) in 1986, evolving from vortex physics, superconducting critical current density and distribution of critical current in wires and tapes for power transmission, to more microscopic aspects and other interests such as dc metamaterials (...