The first‐principles orthogonalized linear combination of atomic orbitals (OLCAO) method for
electronic structure studies has been applied to a variety of complex inorganic crystals. The …

A comprehensive set of calculations of positron lifetimes in bulk metals demonstrate that
experimental lifetimes are reproduced well by a simple first-principles theory in which the …

The temperature dependence between 10 and 300 K of the positron lifetime was measured
in the high-temperature superconductors YBA 2 (Cu 1− x M x) 3 O 6+ δ, where M= Zn and …

The positron lifetime spectra have been measured for an Al-substituted Y1: 2: 3
superconducting ceramic for the first time. The composition is YBa2Cu3− xAlxOy with x= 0 …

We present lifetime and two-dimensional angular correlation of (positron) annihilation
radiation (2D-ACAR) studies on YBa 2 Cu 3 O 7− x single crystals, both on metallic and on …

To clarify the suppressing mechanism of Zn and Al substitution on high-T c
superconductivity, positron annihilation experiment and simulated calculation are used to …

We present calculations of the electron-positron momentum density for the high-T c
superconductor YBa 2 Cu 3 O 7− δ for δ= 0 and for the insulating parent compound YBa 2 …

Positron states and lifetimes at defects in the copper oxide superconductors La 2− x Sr x
CuO 4, YBa 2 Cu 3 O 7− x, and Bi 2 Sr 2 CaCu 2 O 8+ x are calculated with use of the …

In this paper we present detailed calculations of the positron distribution in a host of high-
temperature superconductors using the electron densities and potentials obtained from self …

The authors present the temperature dependence of positron lifetime parameters measured
on a series of specimens of YBa 2 (Cu 1-x M x) 3 O 7-y (M= Fe, Ni, Zn) in the temperature …