TY - JOUR
T1 - Observation of three superconducting transitions in the pressurized CDW-bearing compound TaTe2
AU - Guo, Jing
AU - Huang, Cheng
AU - Luo, Huixia
AU - Yang, Huaixin
AU - Wei, Linlin
AU - Cai, Shu
AU - Zhou, Yazhou
AU - Zhao, Hengcan
AU - Li, Xiaodong
AU - Li, Yanchun
AU - Yang, Ke
AU - Li, Aiguo
AU - Sun, Peijie
AU - Li, Jianqi
AU - Wu, Qi
AU - Cava, Robert J.
AU - Sun, Liling
N1 - Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/5
Y1 - 2022/5
N2 - Transition metal dichalcogenides host a wide variety of lattice and electronic structures, as well as corresponding exotic physical properties, especially under certain tuning conditions. Here, we report the observation of pressure-induced three superconducting transitions in TaTe2, a charge density wave (CDW)-bearing layered transition-metal dichalcogenide that is metallic but not superconducting at ambient pressure. We find that its CDW state can be easily suppressed upon increasing pressure up to ∼1 GPa. A superconducting state then emerges from the suppressed CDW state and persists to the pressure about 7 GPa. Unexpectedly, another superconducting state appears at ∼11 GPa within the same monoclinic (M) structure of its ambient-pressure one. Upon further compression to 21 GPa, a third superconducting state with higher Tc appears from a high-pressure (HP) phase. Our experimental results suggest that the pressure-induced three superconducting transitions in TaTe2 are, respectively, driven by the suppression of the CDW state, the change of the β angle in the M phase and the transition of M-to-HP phase. These results demonstrate not only the versatile nature of this correlated electron system, but also the first experimental example that shows the pressure-induced evolution from a CDW state to three superconducting states driven by different mechanisms.
AB - Transition metal dichalcogenides host a wide variety of lattice and electronic structures, as well as corresponding exotic physical properties, especially under certain tuning conditions. Here, we report the observation of pressure-induced three superconducting transitions in TaTe2, a charge density wave (CDW)-bearing layered transition-metal dichalcogenide that is metallic but not superconducting at ambient pressure. We find that its CDW state can be easily suppressed upon increasing pressure up to ∼1 GPa. A superconducting state then emerges from the suppressed CDW state and persists to the pressure about 7 GPa. Unexpectedly, another superconducting state appears at ∼11 GPa within the same monoclinic (M) structure of its ambient-pressure one. Upon further compression to 21 GPa, a third superconducting state with higher Tc appears from a high-pressure (HP) phase. Our experimental results suggest that the pressure-induced three superconducting transitions in TaTe2 are, respectively, driven by the suppression of the CDW state, the change of the β angle in the M phase and the transition of M-to-HP phase. These results demonstrate not only the versatile nature of this correlated electron system, but also the first experimental example that shows the pressure-induced evolution from a CDW state to three superconducting states driven by different mechanisms.
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U2 - 10.1103/PhysRevMaterials.6.L051801
DO - 10.1103/PhysRevMaterials.6.L051801
M3 - Article
AN - SCOPUS:85130597818
SN - 2475-9953
VL - 6
JO - Physical Review Materials
JF - Physical Review Materials
IS - 5
M1 - L051801
ER -