Pattern of the Tc(p) dependence with huge "anomaly 1/8" - in new property observed in La2-xBaxCuO4 and YBa2Cu3O6+delta at room temperature

TL;DR

This study reveals that weight changes during hydration of cuprate high-temperature superconductors at room temperature mirror their Tc(p) dependence, including the 1/8 anomaly, suggesting new insights into their properties.

Contribution

The research uncovers a novel correlation between hydration-induced weight changes and the Tc(p) dependence, including the 1/8 anomaly, observed at room temperature in cuprate superconductors.

Findings

Weight changes during hydration replicate Tc(p) patterns.

The 1/8 anomaly appears in hydration weight change data.

Room temperature features reflect low-temperature superconducting behavior.

Abstract

Cuprate HTSCs exhibit a dome-shaped dependence of the superconducting transition temperature on the charge carrier concentration, Tc(p), with a maximum at p = 0.16. Near the composition p = 1/8, a dip in Tc is observed (the "1/8 anomaly"), which is associated with charge and spin ordering in the CuO2 planes. By investigating the hydration process of La2-xBaxCuO4 and YBa2Cu3O6+delta conducted at room temperature (RT) and under the influence of a high-frequency magnetic field, we have discovered unusual weight changes in HTSC samples during the initial stage of hydration. For both studied compounds, the dependence of weight changes on the concentration p was found to almost exactly replicate the patterns of the corresponding Tc(p) dependencies, including the "1/8 anomaly". Such a manifestation of characteristic low-temperature features of HTSC systems at RT is intriguing. The results of this experimental work will be useful for the further development of HTSC theories.