Superconductivity appears in the vicinity of semiconducting-like behavior in CeO1-xFxBiS2
Superconductivity appears in the vicinity of semiconducting-like behavior in CeO1-xFxBiS2
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DOI：
10.1103/physrevb.86.214518
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发表时间：
2012-12-28
影响因子：
3.7
通讯作者：
Wen, Hai-Hu
中科院分区：
文献类型：
--
作者：
Xing, Jie;Li, Sheng;Wen, Hai-Hu
系统地用F(0<；x<；0.6)取代O，测量了BIS2基样品CeO1-xFxBiS2的电阻和磁性。与能带结构计算结果对比发现，CeOBiS2的母相是不良金属，而不是带绝缘体。通过在系统中掺杂电子，人们会惊讶地发现，超导与半导体的正常状态一起出现。这种演化明显不同于铜酸盐和铁粒子体系，并被解释为接近具有von Hove奇点和可能的电荷密度波不稳定性的波美兰丘克相变。此外，在所有样品的低温区都观察到了可能由Ce磁矩引起的铁磁性，这表明超导样品中存在超导和铁磁性共存。DOI：10.1103/PhysRevB.86.214518
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. DOI: 10.1103/PhysRevB.86.214518