Pressure-enhanced superconductivity in Eu${}_3$Bi${}_2$S${}_4$F${}_4$

Abstract

The pressure effect on the newly discovered charge-transferred BiS${}_2$-based superconductor, Eu${}_3$Bi${}_2$S${}_4$F${}_4$, with a $T_c$ of 1.5 K at ambient pressure, is investigated by transport and magnetic measurements. Accompanied with the enhancement of metallicity under pressures, the onset superconducting transition temperature increases abruptly around 1.0 GPa, reaching $\sim$10.0 K at 2.26 GPa. AC magnetic susceptibility measurements indicate that a new superconducting phase with a higher $T_c$ emerges and dominates at high pressures. In the broad pressure window of 0.68 GPa$\le$$p$$\le$2.00 GPa, the high-$T_c$ phase coexists with the low-$T_c$ phase. Hall effect measurements reveal a significant difference in electronic structures between the two superconducting phases. Our work devotes the effort to establish the commonality of pressure effect on the BiS${}_2$-based superconductors, and also uncovers the importance of electron carrier density in the high-$T_c$ phase.

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Cited by in corpus (1)

• Unusual mixed valence of Eu in two new materials EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray photoemission Spectroscopy investigations