Superconductivity in Layered van der Waals Hydrogenated Germanene at High Pressure
Structural and superconducting transitions of layered van der Waals (vdW) hydrogenated germanene (GeH) were observed under high-pressure compression and decompression processes. GeH possesses a superconducting transition at critical temperature (Tc) of 5.41 K at 8.39 GPa. A crystalline to amorphous...
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| creator | Xi, Yilian Jing, Xiaoling Xu, Zhongfei Liu, Nana Liu, Yani Miao-Ling, Lin Yang, Ming Sun, Ying Zhuang, Jincheng Xu, Xun Hao, Weichang Li, Yanchun Li, Xiaodong Ping-Heng, Tan Li, Quanjun Liu, Bingbing Shi Xue Dou Du, Yi |
| description | Structural and superconducting transitions of layered van der Waals (vdW) hydrogenated germanene (GeH) were observed under high-pressure compression and decompression processes. GeH possesses a superconducting transition at critical temperature (Tc) of 5.41 K at 8.39 GPa. A crystalline to amorphous transition occurs at 16.80 GPa while superconductivity remains. An abnormally increased Tc up to 6.1 K has been observed in the decompression process while the GeH remained amorphous. Thorough in-situ high-pressure synchrotron X-ray diffraction and in-situ high-pressure Raman spectroscopy with the density functional theory simulations suggest that the superconductivity of GeH should be attributed to the increased density of states at the Fermi level as well as the enhanced electron-phonon coupling effect under high pressure. The decompression-driven superconductivity enhancement arises from pressure-induced phonon softening related to an in-plane Ge-Ge phonon mode. As an amorphous metal hydride superconductor, GeH provides a platform to study amorphous hydride superconductivity in layered vdW materials. |
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GeH possesses a superconducting transition at critical temperature (Tc) of 5.41 K at 8.39 GPa. A crystalline to amorphous transition occurs at 16.80 GPa while superconductivity remains. An abnormally increased Tc up to 6.1 K has been observed in the decompression process while the GeH remained amorphous. Thorough in-situ high-pressure synchrotron X-ray diffraction and in-situ high-pressure Raman spectroscopy with the density functional theory simulations suggest that the superconductivity of GeH should be attributed to the increased density of states at the Fermi level as well as the enhanced electron-phonon coupling effect under high pressure. The decompression-driven superconductivity enhancement arises from pressure-induced phonon softening related to an in-plane Ge-Ge phonon mode. As an amorphous metal hydride superconductor, GeH provides a platform to study amorphous hydride superconductivity in layered vdW materials.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Amorphous materials ; Density functional theory ; Germanium ; Hydrogenation ; Metal hydrides ; Phonons ; Pressure effects ; Raman spectroscopy ; Superconductivity ; Synchrotron radiation ; Synchrotrons</subject><ispartof>arXiv.org, 2021-06</ispartof><rights>2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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GeH possesses a superconducting transition at critical temperature (Tc) of 5.41 K at 8.39 GPa. A crystalline to amorphous transition occurs at 16.80 GPa while superconductivity remains. An abnormally increased Tc up to 6.1 K has been observed in the decompression process while the GeH remained amorphous. Thorough in-situ high-pressure synchrotron X-ray diffraction and in-situ high-pressure Raman spectroscopy with the density functional theory simulations suggest that the superconductivity of GeH should be attributed to the increased density of states at the Fermi level as well as the enhanced electron-phonon coupling effect under high pressure. The decompression-driven superconductivity enhancement arises from pressure-induced phonon softening related to an in-plane Ge-Ge phonon mode. As an amorphous metal hydride superconductor, GeH provides a platform to study amorphous hydride superconductivity in layered vdW materials.</description><subject>Amorphous materials</subject><subject>Density functional theory</subject><subject>Germanium</subject><subject>Hydrogenation</subject><subject>Metal hydrides</subject><subject>Phonons</subject><subject>Pressure effects</subject><subject>Raman spectroscopy</subject><subject>Superconductivity</subject><subject>Synchrotron radiation</subject><subject>Synchrotrons</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNirEKwjAUAIMgWLT_8MC5UFNb7SxqBwdRwbGE5llTNKkvSaF_bwY_QG644W7CIp5lq2S75nzGYmu7NE15seF5nkXscvU9UmO09I1Tg3IjKA0nMSKhhEFokEhwF-JloRolmRa1cCEdkd5Co0YQDirVPuFMaK0nXLDpI-wY_zxny8P-tquSnszHo3V1ZzzpkGqeB4qy5EX23_UFEPk_3g</recordid><startdate>20210604</startdate><enddate>20210604</enddate><creator>Xi, Yilian</creator><creator>Jing, Xiaoling</creator><creator>Xu, Zhongfei</creator><creator>Liu, Nana</creator><creator>Liu, Yani</creator><creator>Miao-Ling, Lin</creator><creator>Yang, Ming</creator><creator>Sun, Ying</creator><creator>Zhuang, Jincheng</creator><creator>Xu, Xun</creator><creator>Hao, Weichang</creator><creator>Li, Yanchun</creator><creator>Li, Xiaodong</creator><creator>Ping-Heng, Tan</creator><creator>Li, Quanjun</creator><creator>Liu, Bingbing</creator><creator>Shi Xue Dou</creator><creator>Du, Yi</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20210604</creationdate><title>Superconductivity in Layered van der Waals Hydrogenated Germanene at High Pressure</title><author>Xi, Yilian ; 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GeH possesses a superconducting transition at critical temperature (Tc) of 5.41 K at 8.39 GPa. A crystalline to amorphous transition occurs at 16.80 GPa while superconductivity remains. An abnormally increased Tc up to 6.1 K has been observed in the decompression process while the GeH remained amorphous. Thorough in-situ high-pressure synchrotron X-ray diffraction and in-situ high-pressure Raman spectroscopy with the density functional theory simulations suggest that the superconductivity of GeH should be attributed to the increased density of states at the Fermi level as well as the enhanced electron-phonon coupling effect under high pressure. The decompression-driven superconductivity enhancement arises from pressure-induced phonon softening related to an in-plane Ge-Ge phonon mode. 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| subjects | Amorphous materials Density functional theory Germanium Hydrogenation Metal hydrides Phonons Pressure effects Raman spectroscopy Superconductivity Synchrotron radiation Synchrotrons |
| title | Superconductivity in Layered van der Waals Hydrogenated Germanene at High Pressure |
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