Prediction of a novel robust superconducting state in TaS2 under high pressure

Literature Information

Publication Date 2020-04-02
DOI 10.1039/D0CP00838A
Impact Factor 3.676
Authors

Xiaojun Wang, Yunxian Liu, Xin Chen, Ping Zhang, Xiaobing Liu


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Abstract

In this work, we performed first-principles structure-searching calculations to investigate the behaviors of tantalum disulfide (TaS2) under compression. Beside the well-known 1T and 2H phases at ambient pressure, our results reveal two new phases with the space group of C2/m (in the pressure range of 27–59 GPa) and I4/mmm (stable above 59 GPa). The C2/m and I4/mmm phases adopt three-dimensional covalent framework structures possessing highly eight-fold and ten-fold coordinated Ta, respectively. Strikingly, we observed an unusual superconductor–metal–superconductor transition in TaS2 with the increase of pressure. The predicted C2/m structure exhibits metallic character, while all the other low-pressure (1T and 2H) and high pressure (I4/mmm) phases of TaS2 show superconductivity under pressure. A robust superconductivity of I4/mmm-TaS2 is predicted up to a maximum transition temperature of 7.62 K at 60 GPa and can be stable up to 200 GPa. Our findings, therefore, provide important information to further understand the intrinsic physics of pressure-driven behaviors in transition metal dichalcogenides and related materials.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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