Synthesis of RuSr2(Ln3/4Ce1/4)2Cu2O10 magneto-superconducting compounds with Ln = Ho, Y and Dy by high-pressure high-temperature (HPHT) technique

TL;DR

This study successfully synthesizes RuSr2(Ln3/4Ce1/4)2Cu2O10 compounds with Ln = Ho, Y, Dy using high-pressure high-temperature methods, revealing their magnetic and superconducting properties at low temperatures.

Contribution

First successful synthesis of Ru-1222 compounds with Ln = Ho, Y, Dy demonstrating coexistence of superconductivity and ferromagnetism.

Findings

Exhibit magnetic transitions around 150 K and superconductivity at lower temperatures.

Show ferromagnetic hysteresis loops at 5 K with near saturation moments above 5 T.

Compare favorably with Gd/Ru-1222 compounds in magnetic behavior.

Abstract

The samples of composition RuSr2(Ln3/4Ce1/4)2Cu2O10 with Ln = Ho, Y and Dy. being synthesized by high pressure high temperature (6Gpa, 1200 0C) solid state synthesis route do crystallize in space group I4/mmm. These samples exhibit magnetic transitions at ~150 K with significant branching of zfc (zero-field-cooled) and fc (field-cooled) magnetization and a sharp cusp in zfc at ~ 100 K, followed by a superconducting transition at lower temperatures. All the compounds show typical ferromagnetic hysteresis loops in magnetic moment (M) versus field (H) magnetization at 5 K. Near saturation of the moments at 5 K is achieved in above 5 T (Tesla) applied fields with a value of ~ 0.80 muB. At low temperatures (5 K) these compounds exhibit both superconductivity and ferromagnetism. To our knowledge these are first successfully synthesized Ru-1222 compounds with various lanthanides including Y, Dy, and Ho. The results are compared with widely reported Gd/Ru-1222 compound.