Possible charge-density wave, superconductivity, and f-electron valence instability in EuBiS2F
Hui-Fei Zhai, Zhang-Tu Tang, Hao Jiang, Kai Xu, Ke Zhang, Pan Zhang, Jin-Ke Bao, Yun-Lei Sun, Wen-He Jiao, I. Nowik, I. Felner, Yu-Ke Li, Xiao-Feng Xu, Qian Tao, Chun-Mu Feng, Zhu-An Xu, Guang-Han Cao
DOI 10.1103/PhysRevB.90.064518 · Physical Review B
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Abstract
Superconductivity (SC) and charge-density wave (CDW) are two contrasting yet relevant collective electronic states, which have received sustained interest for decades. Here, we report that, in a layered europium bismuth sulfofluoride, EuBiS2F, a CDW-like transition occurs at 280 K, below which SC emerges at 0.3 K, without any extrinsic doping. The Eu ions were found to exhibit an anomalously temperature-independent mixed valence of about +2.2, associated with the formation of a possible dynamic CDW. The mixed valence of Eu gives rise to self electron doping into the conduction bands mainly consisting of the in-plane Bi6p states, which in turn brings about the CDW and SC. In particular, the electronic specific-heat coefficient is enhanced by ∼50 times, owing to the significant hybridizations between Eu4f and Bi6p electrons, as verified by band-structure calculations. Thus EuBiS2F manifests itself as an unprecedented material that simultaneously accommodates SC, CDW, and f-electron valence instability.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| EuBiS2F Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.3 | Pressure unresolved | zero_resistance |
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