Coexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe2 superconductor

Menghan Liao, Heng Wang, Yuying Zhu, Runan Shang, Mohsin Rafique, Lexian Yang, Hao Zhang, Ding Zhang () and Qi-Kun Xue ()
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Menghan Liao: Tsinghua University
Heng Wang: Tsinghua University
Yuying Zhu: Tsinghua University
Runan Shang: Beijing Academy of Quantum Information Sciences
Mohsin Rafique: Tsinghua University
Lexian Yang: Tsinghua University
Hao Zhang: Tsinghua University
Ding Zhang: Tsinghua University
Qi-Kun Xue: Tsinghua University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Superconductivity and charge density wave (CDW) appear in the phase diagram of a variety of materials including the high-Tc cuprate family and many transition metal dichalcogenides (TMDs). Their interplay may give rise to exotic quantum phenomena. Here, we show that superconducting arrays can spontaneously form in TiSe2–a TMD with coexisting superconductivity and CDW—after lithium ion intercalation. We induce a superconducting dome in the phase diagram of LixTiSe2 by using the ionic solid-state gating technique. Around optimal doping, we observe magnetoresistance oscillations, indicating the emergence of periodically arranged domains. In the same temperature, magnetic field and carrier density regime where the resistance oscillations occur, we observe signatures for the anomalous metal—a state with a resistance plateau across a wide temperature range below the superconducting transition. Our study not only sheds further insight into the mechanism for the periodic electronic structure, but also reveals the interplay between the anomalous metal and superconducting fluctuations.

Date: 2021
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DOI: 10.1038/s41467-021-25671-8

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