Volume 130, Number 6, June 2020
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 July 2020|
Pressure-induced second high-Tc superconducting phase in the organic-ion-intercalated (CTA)0.3FeSe single crystal
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
2 School of Physical Sciences, University of Chinese Academy of Sciences - Beijing 100190, China
3 Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, and CAS Key Laboratory of Strongly- coupled Quantum Matter Physics, University of Science and Technology of China Hefei, Anhui 230026, China
4 Institute for Solid State Physics, University of Tokyo - 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
5 Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing 210093, China
6 Songshan Lake Materials Laboratory - Dongguan, Guangdong 523808, China
Received: 21 April 2020
Accepted: 17 June 2020
Whether the pressure-induced second high- superconducting phase (SC-II) is a universal phenomenon among the intercalated FeSe-derived superconductors deserves further investigations. Here, we report a high-pressure ac magnetic susceptibility study on the newly synthesized organic-ion-intercalated (CTA)0.3 FeSe single crystal, which has a high at ambient pressure. We found that the superconducting transition is quickly suppressed to below 20 K upon increasing pressure to , above which the SC-II phase emerges and its increases gradually to a maximum of ca. 40 K at 5 GPa. For , both and the superconducting volume decline quickly, presumably due to the collapse of the hybrid structure against the higher pressure. Nevertheless, our results indeed evidenced the pressure-induced SC-II phase in (CTA)0.3 FeSe, in reminiscent of the situations observed in (Li,Fe)OHFeSe and Li0.36 (NH3)y Fe2Se2. These results thus demonstrate that pressure-induced SC-II phase should be a universal phenomenon in the electron-doped intercalated FeSe-based superconductors.
PACS: 74.25.Dw – Superconductivity phase diagrams / 74.70.-b – Superconducting materials other than cuprates
© EPLA, 2020
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