Superconductivity and its Enhancement under High Pressure in "F-free" Single Crystals of CeOBiS${}_2$

Abstract

"F-free" CeOBiS${}_2$ single crystals have successfully grown, thoroughly eliminating a concern about F-contamination by using a high-purity CsCl flux. The obtained crystals have a plate-like shape with a size of 1.0-3.0 mm in the well-developed plane. Single crystal X-ray structural analysis clearly revealed that the CeOBiS${}_2$ crystallizes with a space group $P4/nmm$ (with lattice parameters of $a$ = 4.0189(6) Å, $c$ = 13.573(2) Å). The bond valence sum estimation and X-ray photoelectron spectroscopy analysis showed that the chemical state of Ce was in the mixed valence of Ce${}^{3+}$ and Ce${}^{4+}$. The single crystals show superconductivity with zero resistivity at $\sim$1.3 K. This is the first conclusive evidence of superconductivity driven by Ce valence fluctuation in surely non-doped CeOBiS${}_2$. The superconducting transition temperature was enhanced up to $\sim$3.8 K by applying hydrostatic pressure.

arXiv comment27 pages, 8 figures, J. Alloys and Compd. (2017)

References in corpus (29)

• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Superconductivity of F-substituted LnOBiS2 (Ln = La, Ce, Pr, Nd, Yb) compounds
• Pressure Study of BiS2-Based Superconductors Bi4O4S3 and La(O,F)BiS2
• In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure
• Structural Analysis and Superconducting Properties of F-Substituted NdOBiS2 Single Crystals
• Growth and superconducting properties of F-substituted ROBiS2 (R = La, Ce, Nd) single crystals
• Superconductivity in a new layered bismuth oxyselenide: LaO0.5F0.5BiSe2
• Coexistence of bulk superconductivity and ferromagnetism in CeO1-xFxBiS2
• Unexpected Giant Superconducting Fluctuation and Anomalous Semiconducting Normal State in NdO1-xFxBi1-yS2 Single Crystals
• Crystal structures of LaO1-xFxBiS2 (x~0.23, 0.46): effect of F doping on distortion of Bi-S plane
• Checkerboard stripe electronic state on cleaved surface of NdO${}_{0.7}$F${}_{0.3}$BiS${}_2$ probed by scanning tunneling microscope
• Pronounced - Log T Divergence in Specific Heat of Nonmetallic CeOBiS${}_2$: A Mother Phase of BiS${}_2$-Based Superconductor
• Structures and Optical Absorption of Bi2OS2 and LaOBiS2
• High-temperature thermoelectric properties of novel layered bismuth-sulfide LaO1-xFxBiS2
• Site Selectivity on Chalcogen Atoms in Superconducting La(O,F)BiSSe
• Superconductivity in CeOBiS2 with cerium valence fluctuation
• First single crystal growth and structural analysis of superconducting layered bismuth oxyselenide; La(O,F)BiSe2
• Compositional and temperature evolution of crystal structure of new thermoelectric compound LaOBiS2-xSex
• Coexistence of ferromagnetism and superconductivity in CeO${}_{0.3}$F${}_{0.7}$BiS${}_2$
• Growth and superconducting anisotropies of F-substituted LaOBiSe2 single crystals
• High-Tc Phase of PrO0.5F0.5BiS2 single crystal induced by uniaxial pressure
• Topotactic synthesis of a new BiS2-based superconductor Bi2(O,F)S2
• C-axis electrical resistivity of PrO${}_{1-a}$F${}_a$BiS${}_2$ single crystals
• Pressure-Induced Superconductivity in BiS2-based EuFBiS2
• Pressure-induced phase transition for single crystalline LaO0.5F0.5BiSe2
• Optical spectroscopy study of Nd(O,F)BiS2 single crystals
• Enhanced superconductivity in F-doped LaO1-xFxBiSSe

Cited by in corpus (15)

• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Synthesis, Crystal Structure, and Thermoelectric Properties of Layered Antimony Selenides REOSbSe2 (RE = La, Ce)
• High pressure effects on non-fluorinated BiS2-based superconductors La${}_{1-x}$M${}_x$OBiS${}_2$ (M = Ti and Th)
• Superconductivity in La1-xCexOBiSSe: carrier doping by mixed valence of Ce ions
• Pressure-induced Insulator to Metal Transition of Mixed Valence Compound Ce(O,F)SbS${}_2$
• Growth of superconducting Sm(O,F)BiS2 single crystals
• Superconductivity of Electron-Doped NdOBiS2 by Substitution of Mixed-Valence Ce ions
• Growth and characterization of (La,Ce)OBiS2 single crystals
• Growth and transport properties under high pressure of PrOBiS2 single crystals
• Effects of equivalent composition on superconducting properties of high-entropy REOBiS${}_2$ (RE = La, Ce, Pr, Nd, Sm, Gd) single crystals
• Bulk superconductivity induced by Se substitution in self-doped BiCh2-based compound CeOBiS2-xSex
• Pressure-induced enhancement of two-dimensionality in LaO1-xFxBi(Se/S)2 superconductors
• Suppression of superconductivity by Sb-substitution into CeOBiS2 single crystals
• Superconducting phase diagram of Sb and Se substitution in CeOBiS2 single crystals
• Investigation of superconductivity in Ce-doped (La,Pr)OBiS2 single crystals