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Scaling of pressure-induced and doping-induced superconductivity in the Ca10(PtnAs8)(Fe2As2)5 arsenides | | Peiwen Gao
; Liling Sun
; Ni Ni
; Jing Guo
; Qi Wu
; Chao Zhang
; Dachun Gu
; Ke Yang
; Sheng Jiang
; Robert Joseph Cava
; Zhongxian Zhao
; | | Date: |
14 Jan 2013 | | Abstract: | The Ca10(PtnAs8)(Fe2As2)5 (n=3,4) compounds are a new type of iron pnictide
superconductor whose structures consist of stacking Ca-PtnAs8-Ca-Fe2As2 layers
in a unit cell. When n=3 (the 10-3-8 phase), the undoped compound is an
antiferromagnetic (AFM) semiconductor, while, when n=4 (the 10-4-8 phase), the
undoped compound is a superconductor (Tc=26K), a difference that has been
attributed to the electronic character of the PtnAs8 intermediary layers. Here
we report high-pressure studies on 10-3-8 and 10-4-8, using a combination of
in-situ resistance, magnetic susceptibility, Hall coefficient and X-ray
diffraction measurements. We find that the AFM order in undoped 10-3-8 is
suppressed completely at 3.5 GPa and that superconductivity then appears in the
3.5-7 GPa pressure range with a classic dome-like behavior. In contrast, Tc in
the 10-4-8 phase displays a monotonic decrease with increasing pressure. Our
results allow for the establishment of a unique correspondence between
pressure-induced and doping-induced superconductivity in the high-Tc iron
pnictides, and also points the way to an effective strategy for finding new
high-Tc superconductors. | | Source: | arXiv, 1301.2863 | | Services: | Forum | Review | PDF | Favorites | |
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