Coexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe${}_2$ superconductor

Abstract

Superconductivity and charge density wave (CDW) appear in the phase diagram of a variety of materials including the high - $T$${}_c$ 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 TiSe${}_2$ - a TMD with coexisting superconductivity and CDW - after lithium ion intercalation. We induce a superconducting dome in the phase diagram of Li${}_x$TiSe${}_2$ 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.

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Cited by in corpus (10)

• Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress
• Superconductivity induced by gate-driven hydrogen intercalation in the charge-density-wave compound 1T-TiSe2
• High-Temperature Anomalous Metal States in Iron-Based Interface Superconductors
• Full control of solid-state electrolytes for electrostatic gating
• Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives
• Little-Parks like oscillations in lightly doped cuprate superconductors
• Cluster charge-density-wave glass in hydrogen-intercalated TiSe${}_2$
• Superconducting gap and its Little-Parks like oscillations with high-order harmonics in lithium intercalated 1T-TiSe${}_2$
• Vortex-driven periodic and aperiodic magnetoresistance oscillations in cuprates
• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide