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Superconductivity with Tc of 116 K discovered in antimony polyhydrides

National Science Review 2024年第7期11卷 21-25页

作者： Ke Lu Xin He Changling Zhang Zhiwen Li Sijia Zhang Baosen Min Jun Zhang Jianfa Zhao Luchuan Shi Yi Peng Shaomin Feng Qingqing Liu Jing Song Richeng Yu Xiancheng Wang Yu Wang Maxim Bykov Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Songshan Lake Materials Laboratory Institute of Geosciences Goethe University Frankfurt Institute of Inorganic Chemistry University of Cologne

Superconductivity（SC） was experimentally observed for the first time in antimony polyhydride. The diamond anvil cell combined with a laser heating system was used to synthesize the antimony polyhydride sample at high pressure and high temperature. In-situ high pressure transport measurements as a function of temperature with an applied magnetic field were performed to study the SC properties. It was found that the antimony polyhydride samples show superconducting transition with critical temperature Tc116 K at 184 GPa. The investigation of SC at magnetic field revealed the superconducting coherent length of～40 ? based on the Ginzburg Landau（GL） equation. Antimony polyhydride superconductor has the second highest Tcin addition to sulfur hydride among the polyhydrides of elements from main groups IIIA to VIIA in the periodic table.

关键词： high Tc superconductor antimony polyhydrides high pressure effects

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Thermal conductivity of dense hcp iron:Direct measurements using laser heated diamond anvil cell

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Geoscience Frontiers 2020年第5期11卷 1755-1761页

作者： Pinku Saha Aritra Mazumder Goutam Dev Mukherjee National Centre for high pressure Studies Department of Physical SciencesIndian Institute of Science Education and Research KolkataMohanpur CampusMohanpur741246NadiaWest BengalIndia

Thermal conductivity(k)of iron is measured up to about 134 *** measurements are carried out using the single sided laser heated diamond anvil cell,where the power absorbed by a Fe metal foil at hotspot is calculated using a novel thermodynamical *** conductivity of fee(γ)-Fe increases up to a pressure of about46 *** find thermal conductivity values in the range of 70-80 Wm-1K-1(with an uncertainty of 40%),almost constant with pressure,in the hcp(e)phase of *** attribute the pressure independent k above 46 GPa to the strong electronic correlation effects driven by the electronic topological transition(ETT).We predict a value of thermal conductivity ofε-Fe of about 40±16 Wm-1K-1 at the outer core of Earth.

关键词： Laser heated diamond anvil cell Thermal conductivity high pressure effects Geodynamo

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