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Reemerging superconductivity at 48 K across quantum criticality in iron chalcogenides | | Liling Sun
; Xiao-Jia Chen
; Jing Guo
; Peiwen Gao
; Hangdong Wang
; Minghu Fang
; Xiaolong Chen
; Genfu Chen
; Qi Wu
; Chao Zhang
; Dachun Gu
; Xiaoli Dong
; Ke Yang
; Aiguo Li
; Xi Dai
; Ho-kwang Mao
; Zhongxian Zhao
; | | Date: |
12 Oct 2011 | | Abstract: | Pressure plays an essential role in the induction1 and control2,3 of
superconductivity in iron-based superconductors. Substitution of a smaller
rare-earth ion for the bigger one to simulate the pressure effects has
surprisingly raised the superconducting transition temperature Tc to the record
high 55 K in these materials4,5. However, Tc always goes down after passing
through a maximum at some pressure and the superconductivity eventually tends
to disappear at sufficiently high pressures1-3. Here we show that the
superconductivity can reemerge with a much higher Tc after its destruction upon
compression from the ambient-condition value of around 31 K in newly discovered
iron chalcogenide superconductors. We find that in the second superconducting
phase the maximum Tc is as high as 48.7 K for K0.8Fe1.70Se2 and 48 K for
(Tl0.6Rb0.4)Fe1.67Se2, setting the new Tc record in chalcogenide
superconductors. The presence of the second superconducting phase is proposed
to be related to pressure-induced quantum criticality. Our findings point to
the potential route to the further achievement of high-Tc superconductivity in
iron-based and other superconductors. | | Source: | arXiv, 1110.2600 | | Services: | Forum | Review | PDF | Favorites | |
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