Fermiology of a topological line-nodal compound CaSb2 and its implication to superconductivity: angle-resolved photoemission study
arXiv:2211.15083 · doi:10.1103/PhysRevMaterials.6.104203
Abstract
We performed angle-resolved photoemission spectroscopy with micro-focused beam on a topological line-nodal compound CaSb2 which undergoes a superconducting transition at the onset Tc~1.8 K, to clarify the Fermi-surface topology relevant to the occurrence of superconductivity. We found that a three-dimensional hole pocket at the G point is commonly seen for two types of single-crystalline samples fabricated by different growth conditions. On the other hand, the carrier-doping level estimated from the position of the chemical potential was found to be sensitive to the sample fabrication condition. The cylindrical electron pocket at the Y(C) point predicted by the calculations is absent in one of the two samples, despite the fact that both samples commonly show superconductivity with similar Ts's. This suggests a key role of the three-dimensional hole pocket to the occurrence of superconductivity, and further points to an intriguing possibility to control the topological nature of superconductivity by carrier tuning in CaSb2.
arXiv comment7 pages, 3 figures
References in corpus (37)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Topological Insulators
- Topological insulators and superconductors
- Weyl and Dirac Semimetals in Three Dimensional Solids
- Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
- Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
- Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
- Experimental discovery of Weyl semimetal TaAs
- Topological Insulator Materials
- Topological nodal semimetals
- Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
- Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
- Experimental Realization of a Three-Dimensional Dirac Semimetal
- Dirac Cone Protected by Non-Symmorphic Symmetry and 3D Dirac Line Node in ZrSiS
- Topological nodal line semimetals
- Observation of topological superconductivity on the surface of an iron-based superconductor
- Topological Superconductivity in CuxBi2Se3
- Observation of Topological Nodal Fermion Semimetal Phase in ZrSiS
- Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2
- Discovery of Dirac Node Arcs in PtSn4
- Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As)
- Co-existence of Weyl Fermion and Massless Triply Degenerate Nodal Points
- Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2
- Unconventional Superconductivity at Mesoscopic Point-contacts on the 3-Dimensional Dirac Semi-metal CdAs
- Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS
- Two-Dimensional Oxide Topological Insulator With Iron-Pnictide Superconductor LiFeAs Structure
- Dirac Line-nodes and Effect of Spin-orbit Coupling in Non-symmorphic Critical Semimetal MSiS (M=Hf, Zr)
- Topological superconductivity in Dirac semimetals
- Direct Observation of Nonequivalent Fermi-Arc States of Opposite Surfaces in Noncentrosymmetric Weyl Semimetal NbP
- Observation of Dirac-like energy band and ring-torus Fermi surface associated with the nodal line in topological insulator CaAgAs
- Emergence of topological bands on the surface of ZrSnTe crystal
- -enriched symmetry indicators for topological superconductors in the 1651 magnetic space groups
- Topological Crystalline Materials of Electrons: Antiperovskites, Dirac points, and High Winding Topological Superconductivity
- Superconductivity in the nonsymmorphic line-nodal compound CaSb
- S-wave Superconductivity in the Dirac Line-nodal Material CaSb2
- Peak in the superconducting transition temperature of the nonmagnetic topological line-nodal material CaSb under pressure
- Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb