Spin-glass-like behaviour in SmFeAsO0.8F0.2
Nikolai D. Zhigadlo, Roman Puzniak
TL;DR
This study investigates the magnetic properties of SmFeAsO0.8F0.2, revealing spin-glass-like behavior and confirming bulk superconductivity with a critical temperature of 50 K through susceptibility measurements.
Contribution
It provides evidence of spin-glass-like behavior in SmFeAsO0.8F0.2, a novel observation in this iron-based superconductor, linked to magnetic ordering and cooling history.
Findings
Bulk superconductivity confirmed at Tc = 50 K
Spin-glass-like behavior observed in magnetic susceptibility
Magnetization jump depends on cooling history
Abstract
The iron-based oxypnictide superconductor SmFeAsO0.8F0.2 was synthesized under high-pressure and investigated by measuring dc magnetic susceptibility. The zero-field cooled (ZFC) magnetic susceptibility confirmed the bulk superconductivity of the sample with a critical temperature of Tc = 50 K and a significant jump in the 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 behaviour.
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