Abstract
Resistive and magnetic properties have been measured in BiS 2-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 CeOBiS 2 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.
Original language | English |
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Article number | 214518 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 86 |
Issue number | 21 |
DOIs | |
State | Published - Dec 28 2012 |
Externally published | Yes |