Correlation between Tc and the structural parameters of the cation sublattice in the perovskite layer of HgBa2CuO4 +δ and Tl2Ba2CuO4+δ

Prediction of inorganic superconductors with quasi-one-dimensional crystal structure

“…However, this fact does not hamper their transition into the superconducting state, since there are well-known superconductors (for example, Lu 2 Fe 3 Si 5 and RuZrP, see above) with the quasi-one-dimensional cluster structure, but low transition temperature. Nevertheless, one has grounds to expect high T c in compounds of the structural type Ba 9 Further we will show changes of the most important structural parameters in a row A = Li, Na, K and Rb within the space group I4/mmm using experimental data of [101].…”

“…To predict new superconductors, it is important to know the role of crystal chemistry factors in creating conditions for the emergence of high temperatures of transition into the superconducting state (T c ). The earlier performed studies [6][7][8][9] of high-temperature superconducting cuprates attaining, for the moment, the highest transition temperatures T c , enabled us to reveal these factors. Below we will explain it in more detail.…”

“…We revealed [6][7][8][9] an empirical correlation T c (J) between T c and the value of the ratio (J) of the distance d(Cu-Cu) between copper atoms along the diagonal direction of the CuO 2 plane to the sum of effective distances (D 1 +D 2 ) from the CuO 2 plane to the surface of two adjacent layers of А cations in superconducting fragment (sandwich) A 2 CuO 2 :…”

“…However, the earlier performed studies [6][7][8][9] of correlations between T c and crystal chemistry parameters ratios in superconducting fragments (sandwiches of different families of superconducting cuprates) demonstrated that the maximum value of T c , which could be attained on the basis of the CuO 2 plane, would not exceed ~160 K independently of the number of such planes in a superconductor. So we came to the idea of creating models of superconductors with a quasi-one-dimensional crystal based on the Ginzburg sandwich that could have higher T c .…”

Materials Informatics Reveals Unexplored Structure Space in Cuprate Superconductors

“…However, these increases in Tc have been attributed to the effect of pressure on the position of Ba atoms in the buffer layer. [30,31] 3) There is an apparent optimum in-plane distance for Hg and Tl-based cuprates around ≈1.92 Å (Figure 3A). In contrast, rare-earth-based (RE) cuprates show very little variation in Tc as the in-plane distance changes.…”