In 1988, material research focussed around the study of high temperature superconducting copper-oxides brought about new phases of Cu-O based systems, the two-leg spin-ladders (2LL's), that have the general formula (A 1−x A' x) 14 Cu 24 O 41 , with A an alkaline earth metal and A' a trivalent (transition or lanthanoid) metal [1, 2]. There were well-founded hopes that these materials could provi...

Co (3%)-doped ZnO and Co, Cu (Co = 3% 2 to 4%) dual-doped nanostructures were prepared using chemical co-precipitation route. The structural analysis indicated no alteration in the structure of hexagonal absence secondary/impurity phases induced by Co/Cu addition into ZnO. reduction crystallite size (≈ 25 nm) at 2% is due suppression growth rate dissimilarities between Co2+/Cu2+ Zn2+ ions, enha...

A series of bismuth based superconducting materials doped with galliumBi Pb Sr Ca Cu Ga O 1.7 0.4 2 2 3-x x y (x = 0.0, 0.02, 0.04, 0.06, 0.08 and 0.10) was synthesized by Simple solid-state reaction method. The samples were characterized by X-ray diffraction, EDX analysis and electrical resistivity and ac magnetic susceptibility measurements. All the samples consist of both low-T (2212) and Hi...

There are considerable interests in topological superconductivity in condensed matter physics. In this talk, I will present our recent works on topological superconductors and the related phenomena. In particular, I will discuss how topological non-trivial structures in normal states may arise non-trivial quantum phenomena in the superconducting states. As examples, I will discuss odd parity su...

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DLTS and associated electrical measurements were made on unintentionally doped CdTe crystals obtained from several vendors, on Cu-doped CdTe, and on Te-annealed CdTe. All of the crystals were p-type. Four majority carrier deep levels were observed in the temperature range from 100-300 K with activation energies relative to the valence band of0.2, 0.41, 0.45, and 0.65 eV. Two of these levels wer...

Gas sensing properties of metal oxide nanopowders (ZnO, TiO2, WO3, SnO2) with average diameters of 40-60 nm were analyzed by room-temperature photoluminescence spectroscopy. The influence of gas environment (O2, N2, H2, CO, CO2) on the emission intensity was investigated for metal oxide nanopowders with surface doped by impurities (Pt, Ag, Au, Sn, Ni or Cu). Established physicochemical regulari...

We report Cu NMR studies on uniaxially aligned and unaligned powder samples of an electron-doped infinitely-layered high Tc cuprate superconductor Sr0.9La0.1CuO2 (Tc =42 K). We measured the nuclear spin-lattice relaxation rate 1/T1 up to 800 K. We found from the temperature dependence of 1/T1T that the wave-vector-averaged spin susceptibility is highly enhanced by spin-fluctuations in the norma...