Anomalous He-Gas High-Pressure Studies on Superconducting LaO1-xFxFeAs

Details Anomalous He-Gas High-Pressure Studies on Superconducting LaO1-xFxFeAs Anomalous He-Gas High-Pressure Studies on Superconducting LaO1-xFxFeAs

2009-11-27

arxiv.org/abs/0911.5314v1

New Journal of Physics 12, 023005 (2010).

Physics

Condensed Matter

Superconductivity

Scientific paper

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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