Superconductivity in CeOBiS2 with cerium valence fluctuation

Abstract

Resistivities of single-crystalline as well as poly-crystalline samples of CeOBiS2 without fluorine doping were measured at temperatures down to 0.13 K, and were compared with those of poly-crystalline LaOBiS2 and PrOBiS2. Both poly-crystalline and single-crystalline CeOBiS2 exhibited zero resistivity below 1.2 K while poly-crystalline LaOBiS2 and PrOBiS2 did not show zero resistivity down to 0.13 K. Superconducting transition temperature of CeOBiS2 was reduced by increasing the applied current density. The superconductivity of CeOBiS2 without chemical doping is likely triggered by the carriers induced by the valence fluctuation between Ce3+ and Ce4+.

19 pages, 5 figures in Solid State Communications 2016

References in corpus (6)

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Cited by in corpus (8)

• Superconductivity and its Enhancement under High Pressure in "F-free" Single Crystals of CeOBiS${}_2$
• Growth of superconducting Sm(O,F)BiS2 single crystals
• Growth and characterization of (La,Ce)OBiS2 single crystals
• Effects of equivalent composition on superconducting properties of high-entropy REOBiS${}_2$ (RE = La, Ce, Pr, Nd, Sm, Gd) single crystals
• Growth and transport properties under high pressure of PrOBiS2 single crystals
• Investigation of superconducting properties and possible nematic superconductivity in self-doped BiCh2-based superconductor CeOBiS1.7Se0.3
• Investigation of superconductivity in Ce-doped (La,Pr)OBiS2 single crystals
• Superconducting phase diagram of Sb and Se substitution in CeOBiS2 single crystals