Enhancement of T_c by Uniaxial Lattice Contraction in BiS₂-Based Superconductor PrO_0.5F_0.5BiS₂

High-Tc Phase of PrO0.5F0.5BiS2 single crystal induced by uniaxial pressure

“…The partial substitution of O by F is useful for this carrier doping. Although, optimal fluorine concentration is estimated to be around x = 0.5, the obtained superconducting transition temperature (T c ) is completely different between conventional solid state reactions and high pressure synthesis [2,[13][14][15]. In the case of the conventional solid state reaction, the T c of LaO 0.5 F 0.5 BiS 2 is obtained at only 3 K. On the other hand, the T c largely increases above 10 K by using high pressure synthesis.…”

Synthesis and Properties of SmO0.5F0.5BiS2 and Enhancement in Tc in La1–ySmyO0.5F0.5BiS2

“…9 Superconductivity in LnO 1-x F x BiS 2 with Ln = Ce, Pr, Nd and Yb also followed soon. [10][11][12][13][14][15][16] T c is enhanced by chemical pressure [18][19][20] or external applied pressure [22][23][24][25][26][27] as observed for LnOFeAs 28 for example in LnO 1-x F x BiS 2 , a slight enhancement in T c has been reported by substituting Se at the S sites or by inter-mixing rare earth ions. [18][19][20][21] Hole doping via alkali earthmetal-substitution at Ln-site did not yield superconductivity.…”

Increase in T c and Change of Crystal Structure by High-Pressure Annealing in BiS2-Based Superconductor CeO0.3 F 0.7BiS2

“…18,19) In this study, we focus on CeO 0.3 F 0.7 BiS 2 . In the previous studies, it was reported that As-grown CeO 0.3 F 0.7 BiS 2 does not show bulk superconductivity.…”