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We investigated the crystal structure and superconducting properties ofAs-grown and high-pressure-annealed PrO0.5F0.5BiS2. We found that thehigh-pressure annealing generates uniaxial lattice contraction along the caxis. Both As-grown and high-pressure-annealed PrO0.5F0.5BiS2 show bulksuperconductivity. The Tc of PrO0.5F0.5BiS2 is clearly enhanced from Tczero =3.6 K to Tczero = 5.5 K by high-pressure annealing. Unexpectedly, thesemiconducting characteristics is relatively enhanced by high-pressureannealing. Namely, we assume that the enhancement of Tc can not be understoodby an increase of electron carriers. Having considered these facts, we concludethat the enhancement of Tc correlates with uniaxial lattice contraction alongthe c axis in PrO0.5F0.5BiS2.

Enhancement of Tc by uniaxial lattice contraction in BiS2-based superconductor PrO0.5F0.5BiS2