Anomalous He-Gas High-Pressure Studies on Superconducting LaO1-xFxFeAs
W. Bi, H. B. Banks, J. S. Schilling, H. Takahashi, H. Okada, Y., Kamihara, M. Hirano, H. Hosono
TL;DR
This study investigates how helium-gas pressure affects the superconducting transition temperature of LaO1-xFxFeAs, revealing that pressure effects are highly sensitive to experimental conditions and stress history.
Contribution
It provides new insights into the pressure dependence of Tc in LaO1-xFxFeAs using He-gas, highlighting the influence of shear stresses and experimental history.
Findings
dTc/dP values differ from previous studies
Tc(P) depends on pressure/temperature history
High sensitivity of Tc to shear stresses
Abstract
AC susceptibility measurements have been carried out on superconducting LaO1-xFxFeAs for x=0.07 and 0.14 under He-gas pressures to about 0.8 GPa. Not only do the measured values of dTc/dP differ substantially from those obtained in previous studies using other pressure media, but the Tc(P) dependences observed depend on the detailed pressure/temperature history of the sample. A sizeable sensitivity of Tc(P) to shear stresses provides a possible explanation.
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