Why Tc of MgB2 is the highest in a number of diborides?
It is shown, that the problem rising Tc diborides is a problem of nonstoichiometry in a plane of boron in diborides of heavy metals being compounds of variable composition.
cond-mat.supr-con↗
arXiv subjects
L. M. Volkova
Publications and source records attributed to L. M. Volkova.
Crystal Chemical Estimation of Possible Exceeding of Tc of 77 K in Diborides
We establish the empirical correlation between Tc and crystal chemical parameters in diborides. Our results suggest that Tc of diborides can be higher 77K.
cond-mat.supr-con↗
Absence of a Competition between Magnetism and Superconductivity in the Layered Nickel Borocarbides: Common Correlation Tc with Crystal Chemical Parameters for Magnetic and Nonmagnetic Compounds
In the work the analysis of crystal chemical researches of nickel borocarbides RNi2B2C (R = rare earth) is given. The reasons of representation of dependence of Tc from crystal chemical parameters by two separate curves for magnetic and nonmagnetic R are considered. Common for all R dependences of Tc from crystal chemical parameters similar existing in layered quasi-two-dimensional systems (HTSC cuprates and diborides) are established. The absence of influence on borocarbides Tc of magnetic properties R is determined. On the basis of the found correlations the radii of a number of rare earths are precised and Tc of compounds at various substitutions R are calculated.
cond-mat.supr-con↗