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29 March 2024
 
  » arxiv » 1611.3330

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The vital role of hole-carriers for superconductivity in pressurized black phosphorus
Jing Guo ; Honghong Wang ; Fabian von Rohr ; Wei Yi ; Yazhou Zhou ; Zhe Wang ; Shu Cai ; Shan Zhang ; Xiaodong Li ; Yanchuan Li ; Jing Liu ; Ke Yang ; Aiguo Li ; Sheng Jiang ; Qi Wu ; Tao Xiang ; Robert J Cava ; Liling Sun ;
Date 10 Nov 2016
AbstractThe influence of carrier type on superconductivity has been an important issue for understanding both conventional and unconventional superconductors [1-7]. For elements that superconduct, it is known that hole-carriers govern the superconductivity for transition and main group metals [8-10]. The role of hole-carriers in elements that are not normally conducting but can be converted to superconductors, however, remains unclear due to the lack of experimental data. Here we report the first in-situ high pressure Hall effect measurements on single crystal black phosphorus, measured up to ~ 50 GPa, and find a correlation between the Hall coefficient and the superconducting transition temperature (TC). Our results reveal that hole-carriers play a vital role in developing superconductivity and enhancing TC. Importantly, we also find a Lifshitz transition in the high-pressure cubic phase at ~17.2GPa, which uncovers the origin of a puzzling valley in the superconducting TC-pressure phase diagram. These results offer insight into the role of hole-carriers in developing superconductivity in simple semiconducting solids under pressure.
Source arXiv, 1611.3330
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