Electromagnetic response of LaO_0.94F_0.06FeAs: AC susceptibility and microwave surface resistance

TL;DR

This study investigates the electromagnetic properties of LaO_0.94F_0.06FeAs, revealing nonlinear effects and hysteresis behaviors in AC susceptibility and microwave surface resistance under magnetic fields, challenging existing models.

Contribution

It provides new insights into the nonlinear electromagnetic response and hysteresis phenomena in LaO_0.94F_0.06FeAs, highlighting effects not explained by traditional critical-state models.

Findings

Strong dependence of susceptibility on AC field amplitude

Magnetic hysteresis in susceptibility due to intragrain effects

Microwave surface resistance hysteresis not explained by Abrikosov flux models

Abstract

We discuss on the electromagnetic response of a polycrystalline sample of LaO_0.94F_0.06FeAs exposed to DC magnetic fields up to 10 kOe. The low- and high-frequency responses have been investigated by measuring the AC susceptibility at 100 kHz and the microwave surface resistance at 9.6 GHz. At low as well as high DC magnetic fields, the susceptibility strongly depends on the amplitude of the AC driving field, highlighting enhanced nonlinear effects. The field dependence of the AC susceptibility exhibits a magnetic hysteresis that can be justified considering the intragrain-field-penetration effects on the intergrain critical current density. The microwave surface resistance exhibits a clockwise magnetic hysteresis, which cannot be justified in the framework of the critical-state models of the Abrikosov-fluxon lattice; it may have the same origin as that detected in the susceptibility.