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Application of high pressure (HP) induces evolution from metallic tosemi-metallic state in the layered superconducting LaO1-xFxBiSe2 phase, asconcluded from ab initio calculations based on experimental P-dependentstructural data. These changes in conduction properties are associated with areported decrease in the superconducting transition temperature, Tc. However,further increase in pressure induces structural transformation in LaO1-xFxBiSe2which results in a strong enhancement of its two-dimensionality with a relatedimprovement in superconducting performance. In addition, the HP structuralanisotropy induces a loss of long-range order correlations along the stackingdirection of the LaO/F and BiSe2 layers yielding formation of stacking faults.Similar but even more pronounced structural transition was observed in therelated LaO1-xFxBiS2 phase which is also accompanied by an increase in Tc. Thisdemonstrates that enhancement of two-dimensionality in layered superconductingsystems acts in favor of their superconducting performance.

Pressure-induced enhancement of two-dimensionality in LaO1-xFxBi(Se/S)2 superconductors