Superconductivity in tantalum self-intercalated 4$Ha$-Ta${}_{1.03}$Se${}_2$

Abstract

TaSe${}_2$ has several different polytypes and abundant physical properties such as superconductivity and charge density waves (CDW), which had been investigated in the past few decades. However, there is no report on the physical properties of 4$Ha$ polytype up to now. Here we report the crystal growth and discovery of superconductivity in the tantalum self-intercalated 4$Ha$-Ta${}_{1.03}$Se${}_2$ single crystal with a superconducting transition onset temperature $T_{\mathrm{c}}$ $\approx$ 2.7 K, which is the first observation of superconductivity in 4$Ha$ polytype of TaSe${}_2$. A slightly suppressed CDW transition is found around 106 K. A large ${\mu }_0{H}_{c2}/T_{\mathrm{c}}$ value of about 4.48 is found when magnetic field is applied in the $ab$ plane, which probably results from the enhanced spin-orbit coupling(SOC). Special stacking faults are observed, which further enhance the anisotropy. Although the density of states at the Fermi level is lower than that of other polytypes, $T_{\mathrm{c}}$ remains the same, indicating the stack mode of 4$Ha$ polytype may be beneficial to superconductivity in TaSe${}_2$.

arXiv comment7 pages, 4 figures

References in corpus (11)

• Titanic Magnetoresistance in WTe2
• Superconductivity in Cu_xTiSe_2
• Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Controlling many-body states by the electric-field effect in a two-dimensional material
• Strong enhancement of superconductivity at high pressures within the charge-density-wave states of 2H-TaS 2 and 2H-TaSe 2
• Polytypism, polymorphism and superconductivity in TaSe2-xTex
• Disorder suppressed charge-density-wave and its origin in 1T-TaSe2-xTex
• Nature of charge density waves and superconductivity in 1\emph{T}-TaSe${}_{2-x}$Te${}_x$
• Controllable spin-orbit coupling and its influence on the upper critical field in the chemically doped quasi-one-dimensional Nb${}_2$PdS${}_5$ superconductor
• Enhanced superconductivity in hole-doped Nb${}_2$PdS${}_5$

Cited by in corpus (4)

• Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors
• Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2
• Anisotropic gapping of topological Weyl rings in the charge-density-wave superconductor InxTaSe2
• Superconducting Sn-Intercalated TaSe${}_2$: Structural Diversity Obscured by Routine Characterization Techniques