Superconductivity appears in the vicinity of semiconducting-like behavior in CeO1−xFxBiS2
Jie Xing, Sheng Li, Xiaxin Ding, Huan Yang, Hai-Hu Wen
DOI 10.1103/PhysRevB.86.214518 · Physical Review B
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Abstract
Resistive and magnetic properties have been measured in BiS2-based samples CeO1−xFxBiS2 with a systematic substitution of O with F (0<x<0.6). In contrast to the band-structure calculations, it is found that the parent phase of CeOBiS2 is a bad metal instead of a band insulator. By doping electrons into the system, it is surprising to find that superconductivity appears together with a semiconducting normal state. This evolution is clearly different from the cuprate and the iron pnictide systems, and is interpreted as approaching the Pomeranchuk transition with a von Hove singularity and the possible charge-density-wave instability. Furthermore, ferromagnetism, which may arise from the Ce magnetic moments, has been observed in the low-temperature region in all samples, suggesting the coexistence of superconductivity and ferromagnetism in the superconducting samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | onset |
| Bi4O4S3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.6 | Pressure not reported | onset |
| LaO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.6 | Pressure not reported | unknown |
| NdO1-xFxBiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.6 | Pressure not reported | onset |
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