Rational Design of High-Tc Superconductivity in the Z = 6.0 Family

Rational design of superconductivity from Periodic Table properties is one of the grand challenges of superconductivity. We recently showed (Arxiv: 1208.0071) that high-Tc superconductivity exists in the Z = 5.667 with Ne=2.333. Here we propose and show that materials with Z = 6.0 and Ne =2.0 and 2.22 also meet the conditions for high-Tc superconductivity. We predict that the Ne=2.67 variety will not be superconducting but the ternary and quaternary systems of the Z =6.0 family with Ne=2.0 and 2.22 would have 12.5leqFw/Zleq25 and Tcs that fall in the range 60K - 100K. We provide material specific examples of such potential low-Z, Low-Ne high-Tc superconductors.

Rational Design of High-Tc Superconductivity in the Z = 5.67 Family with Ne = 2.33

The concepts of Rational Design of Superconductivity from Periodic Table properties were proposed in an earlier paper (ArXiv: 1204.0233). We had shown latter too that high-Tc superconductivity exists in the Z=7.333 family with Ne=2.667, of which MgB2 is a member. Here we propose and show that compounds with Z = 5.667 and Ne=2.333 will meet the conditions for high-Tc superconductivity similar to the Z = 7.333 family. The predicted Tcs for the ternary and quaternary systems of the Z =5.667 family would fall in the range 40K - 100K. We give material specific examples of some such possible rational designs of high-Tc superconductivity.

Transition Temperatures of Superconductors estimated from Periodic Table Properties

Predicting the transition temperature, Tc, of a superconductor from Periodic Table normal state properties is regarded as one of the grand challenges of superconductivity. By studying the correlations of Periodic Table properties with known superconductors, it is possible to estimate their transition temperatures. Starting from the isotope effect and correlations of superconductivity with electronegativity (Chi), valence electron count per atom (Ne), atomic number(Z) and formula weight (Fw), we derive an empirical formula for estimating Tc that includes an unknown parameter,(Ko). With average values of Chi, Ne and Z, we develop a material specific characterization dataset (MSCD) model of a superconductor that is quantitatively useful for characterizing and comparing superconductors. We show that for most superconductors, Ko correlates with Fw/Z, Ne, Z, number of atoms (An) in the formula, number of elements (En) and with Tc. We study some superconductor families and use the discovered correlations to predict similar and novel superconductors and also estimate their Tcs. Thus the material specific equations derived in this paper, the material specific characterization dataset (MSCD) system developed here and the discovered correlation between Tc and Fw/Z, En and An, provide the building blocks for the analysis, design and search of potential novel high temperature superconductors with specific estimated Tcs.