From domain walls and the stripe phase to full suppression of charge density waves in superconducting 1T−Ti1−xTaxSe2

Q. Hu; R. Venturini; Y. Vaskivskyi; J. Lipič; Z. Jagličić; D. Mihailovic

doi:10.1103/PhysRevB.110.165156

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From domain walls and the stripe phase to full suppression of charge density waves in superconducting 1T−Ti1−xTaxSe2

Q. Hu, R. Venturini, Y. Vaskivskyi, J. Lipič, Z. Jagličić, D. Mihailovic

DOI 10.1103/PhysRevB.110.165156 · Physical Review B

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Abstract

Transition metal dichalcogenide 1T−TiSe2 hosts a 2×2×2 charge density wave (CDW) that is known to form the state with localized domains separated by the domain walls upon Cu intercalation. The CDW state with the domain-wall network has attracted significant interest due to its coexistence with superconductivity. Here, we present a scanning tunneling microscopy, transport, and magnetic susceptibility study of 1T−Ti1−xTaxSe2. Ta substitution for Ti atoms allows us to perform experiments over the wide range of doping (0≤x≤0.2), providing access to a significantly broader phase diagram than Cu intercalation experiments. At x=0.02, we observe a complex network of domains and domain walls. We identify two distinct types of domain walls and show their structure with atomic resolution. Additionally, an elusive symmetry-breaking stripe CDW is found at the light substitution of x=0.02. We also measure highly substituted x=0.2 crystals that are superconducting despite the full collapse of the CDW order. Our results uncover rich CDW physics in Ta-substituted 1T−TiSe2 crystals and illuminate the interplay between the CDW and superconductivity.