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journal article·2021-06-21

Lattice melting and superconductivity in a group IV-VI compound

Liu-Cheng Chen, Pei-Qi Chen, Wei-Jian Li, Qian Zhang, Viktor V. Struzhkin, Alexander F. Goncharov, Zhifeng Ren, Xiao-Jia Chen

Physical Review B· Volume 103· Issue 21
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Source abstract

Abstract

Inspired by the rich physical properties of IV-VI compounds, we choose polycrystalline ${\mathrm{Pb}}0.99{\mathrm{Cr}}0.01\mathrm{Se}$ to investigate its structural, vibrational, and electrical transport properties under pressure up to 50 GPa. The structural transitions from the $B1$ to $Pnma$ phase and then to the $B2$ phase in this sample are verified by the x-ray diffraction and Raman scattering measurements. The formation of the intermediate phase is suggested to be mediated by Peierls distortion, and the broad hump in the temperature-dependent resistivity in the intermediate phase gives further evidence of this phenomenon. When the material evolves into the $B2$ phase, superconductivity is observed to emerge, accompanied by suppressing the broad hump of resistivity at intermediate temperatures. Meanwhile, Hall coefficient measurements indicate that the carrier type changes during the structural transitions. These results suggest that the superconductivity in the $B2$ phase for this material is originated by ``melting'' the Peierls lattice distortion. By extending the present findings to other similar IV-VI semiconductors, we propose that all group IV-VI compounds could exhibit superconductivity in their $B2$ phase due to the lattice melting at high pressures.
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Research context

Electronic materials

OpenAlex topics: Iron-based superconductors research · Advanced Thermoelectric Materials and Devices · Rare-earth and actinide compounds

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Science, Harbin Institute of Technology, Shenzhen 518055, China

Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China

Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China

Department of Physics and TcSUH, University of Houston, Texas 77204, USA

Earth and Planets Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA

Funding

Shenzhen Science and Technology Innovation Commission · National Postdoctoral Program for Innovative Talents · National Natural Science Foundation of China · Natural Science Foundation of Guangdong Province · University of Houston · U.S. Department of Energy · National Basic Research Program of China · National Science Foundation · Argonne National Laboratory · Basic Research Program of Shenzhen · Cheung Kong Scholar Reward Program Young Scholar Program of China

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