Magneto-superconductivity of 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10

TL;DR

This study investigates the magnetic and superconducting properties of RuSr2Gd1.5Ce0.5Cu2O10 after oxygen annealing at 100 atm, revealing coexistence of magnetism and superconductivity with detailed magnetic transition and resistance behavior.

Contribution

First detailed analysis of magneto-superconductivity in 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10, including magnetic transitions and resistance characteristics.

Findings

Magnetic transition at 100 K and superconductivity at 40 K observed.

Superconductivity confirmed around 43 K with broad transition under magnetic field.

Ferromagnetic component persists at low temperatures with high saturation fields.

Abstract

Studied 100-atm O2-annealed RuSr2Gd1.5Ce0.5Cu2O10 (Ru-1222) compound crystallized in a tetragonal I4/mmm space group crystal structure. Thermo-gravemetric (TG) analysis of the compound showed the release of oxygen and breaking to metallic constituents in two distinct steps at around 350 and 500 0C. The DC magnetization data (M vs. T) revealed magnetic transition at 100 K followed by superconducting transition at 40 K. Low field M vs. H hysteresis loop showed a lower critical field (Hc1) value of around 25 Oe. Ferromagnetic component is evidenced at 5, 10, 20 and 40 K. Near saturation field of above 5 Tesla is observed at 5 K. Zero-field returning moment (Mr) and zero-moment coercive field (Hc) values at 5 K are 0.35mB and 250 Oe. The resistance vs. temperature (R vs. T) behaviour of the sample confirmed superconductivity at around 43 K. Superconductivity transition (Tc) is broadened under magnetic field with strong granularity like steps.