Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
arXiv:1605.05903 · doi:10.1038/srep26168
Abstract
The discovery of two-dimensional superconductivity in Bi2Te3/FeTe heterostructure provides a new platform for the search of Majorana fermions in condensed matter systems. Since Majorana fermions are expected to reside at the core of the vortices, a close examination of the vortex dynamics in superconducting interface is of paramount importance. Here, we report the robustness of the interfacial superconductivity and 2D vortex dynamics in four as-grown and aged Bi2Te3/FeTe heterostructure with different Bi2Te3 epilayer thickness (3, 5, 7, 14 nm). After two years' air exposure, superconductivity remains robust even when the thickness of Bi2Te3 epilayer is down to 3 nm. Meanwhile, a new feature at ~13 K is induced in the aged samples, and the high field studies reveal its relevance to superconductivity. The resistance of all as-grown and aged heterostructures, just below the superconducting transition temperature follows the Arrhenius relation, indicating the thermally activated flux flow behavior at the interface of Bi2Te3 and FeTe. Moreover, the activation energy exhibits a logarithmic dependence on the magnetic field, providing a compelling evidence for the 2D vortex dynamics in this novel system. The weak disorder associated with aging-induced Te vacancies is possibly responsible for these observed phenomena.
arXiv comment21 pages, article+supplemental information, published in Scientific Reports
References in corpus (31)
- Topological Insulators
- Topological insulators and superconductors
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- Search for Majorana fermions in superconductors
- Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
- Aharonov-Bohm interference in topological insulator nanoribbons
- Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
- The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
- Impurity effect on weak anti-localization in the topological insulator Bi2Te3
- Negative Magnetoresistance in Dirac Semimetal Cd3As2
- Quantum interference in macroscopic crystals of non-metallic BiSe
- Unconventional Josephson Effect in Hybrid Superconductor-Topological Insulator Devices
- Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
- Competition between weak localization and antilocalization in topological surface states
- Josephson supercurrent through a topological insulator surface state
- Nature of the Quantum Metal in a Two-Dimensional Crystalline Superconductor
- Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
- Proximity-induced high-temperature superconductivity in topological insulators Bi2Se3 and Bi2Te3
- Two-dimensional superconductivity at the interface of a Bi2Te3/FeTe heterostructure
- Extremely strong coupling superconductivity in artificial two-dimensional Kondo lattices
- Observation of the superconducting proximity effect and possible evidence for Pearl vortices in a candidate topological insulator
- High temperature superconducting FeSe films on SrTiO3 substrates
- Critical fields, thermally-activated transport and critical current density of beta-FeSe single crystals
- Anomalous Upper Critical Field in CeCoIn_5/YbCoIn_5 Superlattices with a Rashba-type Heavy Fermion Interface
- Thermally activated energy and flux flow Hall effect of Fe1+y(Te1-xSx)z
- Controllable Rashba spin-orbit interaction in artificially engineered superlattices involving the heavy-fermion superconductor CeCoIn5
- Revealing surface states in In-doped SnTe superconducting nanoplates with low bulk mobility
- A Natural Topological Insulator
- Deviations from plastic barriers in BiSrCaCuO thin films
- Tunable interaction-induced localization of surface electrons in antidot nanostructured Bi2Te3 thin films
- Anisotropic upper critical field of BiS2-based superconductor LaO0.5F0.5BiS2