Spin-glass-like behavior in SmFeAsO0.8F0.2

The iron-based oxypnictide superconductor SmFeAsO0.8F0.2 was synthesized under high pressure and investigated by measuring the dc magnetic susceptibility. The zero-field cooled (ZFC) magnetic susceptibility confirmed the bulk superconductivity of the sample with a critical temperature T-c 50 K and a significant jump in magnetization at ~4.3 K, usually attributed to the antiferromagnetic ordering of Sm3+ ions in this system. Since the occurrence of the jump depends on the cooling history, our data strongly suggest a spin-glass-like behavior.

Automated summary

The iron-based oxypnictide superconductor SmFeAsO0.8F0.2 was synthesized under high pressure and showed bulk superconductivity along with antiferromagnetic behavior. The significant jump in magnetization observed at low temperature suggests a spin-glass-like behavior in this material.