Superconductivity in the antiperovskite Dirac-metal oxide Sr${}_3$SnO

Abstract

Oxides with perovskite-based structures have been known as essential materials for fascinating phenomena such as high-temperature and unconventional superconductivity. Discoveries of these oxide superconductors have driven the science community to vastly extend the concepts of strongly correlated electron systems. The base of these materials, the cubic perovskite oxides, $AB$O${}_3$, also exhibit superconductivity with $T_{\mathrm{c}}$ of up to 30 K, as reported for Ba${}_{0.6}$K${}_{0.4}$BiO${}_3$. Perovskite oxides have their counterparts, antiperovskite oxides $A_{3}B$O (or "$B$O$A_3$"), in which the position of metal and oxygen ions are reversed and therefore metallic $B$ ions take unusual negative valence states. However, no superconductivity has been reported among antiperovskite oxides. Here, we report the discovery of the first superconducting antiperovskite oxide Sr${}_3$SnO with $T_{\mathrm{c}}$ of around 5 K. Sr${}_3$SnO possesses Dirac points in its electronic structure, originating from the inversion of bands with different parities. Based on theoretical analysis, we propose possibility of topological odd-parity superconductivity analogous to the superfluid ${}^3$He-B, in moderately hole-doped Sr${}_3$SnO, originating from unusual orbital texture on the Fermi surface. We envision that this discovery of a new class of oxide superconductor with the inverted valence configuration will stimulate the exploration of topological materials science based on a variety of antiperovskite oxides.

24 pages, 9 figures

References in corpus (13)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Odd-Parity Topological Superconductors: Theory and Application to Cu${}_x$Bi${}_2$Se${}_3$
• Topological odd-parity superconductors
• Topological superconductivity in Dirac semimetals
• Topological properties of spin-triplet superconductors and the Fermi surface topology in the normal state
• Topological Crystalline Insulators and Dirac Octets in Anti-perovskites
• False-positive and False-negative assignments of Topological Insulators in Density-Functional Theory and Hybrids
• Three-Dimensional Dirac Electrons at the Fermi Energy in Cubic Inverse Perovskites: Ca_3PbO and its Family
• New class of topological superconductors protected by magnetic group symmetries
• Non-Abelian Statistics of Axion Strings
• Superconductivity in doped Dirac semimetals
• New anti-perovskite-type Superconductor ZnNyNi3
• Compact AC Susceptometer for Fast Sample Characterization down to 0.1 K

Cited by in corpus (45)

• Strain-engineered Majorana Zero Energy Modes and ϕ0 Josephson State in Black Phosphorus
• Type-II Dirac surface states in topological crystalline insulators
• Robust weak antilocalization due to spin-orbital entanglement in Dirac material Sr${}_3$SnO
• Topological Crystalline Materials of $J=3/2$ Electrons: Antiperovskites, Dirac points, and High Winding Topological Superconductivity
• Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
• Controlled synthesis of the antiperovskite oxide superconductor Sr${}_{3-x}$SnO
• Singlet-Quintet Mixing in Spin-Orbit Coupled Superconductors with j=3/2 Fermions
• Topological Properties and Functionalities in Oxide Thin Films and Interfaces
• Higher-order topological insulators in antiperovskites
• Majorana multipole response of topological superconductors
• Comparative first-principles study of antiperovskite oxides and nitrides as thermoelectric material: multiple Dirac cones, low-dimensional band dispersion, and high valley degeneracy
• Magnetotransport in Sr3PbO antiperovskite with three-dimensional massive Dirac electrons
• Topological Vortex Phase Transitions in Iron-Based Superconductors
• Superconductivity in the nonsymmorphic line-nodal compound CaSb${}_2$
• Planar Hall effect with sixfold oscillations in a Dirac antiperovskite
• Unusual Valence State in the Antiperovskites Sr${}_3$SnO and Sr${}_3$PbO Revealed by X-ray Photoelectron Spectroscopy
• Growth of Antiperovskite Oxide Ca3SnO Films by Pulsed Laser Deposition
• Double Majorana vortex zero modes in superconducting topological crystalline insulators with surface rotation anomaly
• Enhanced thermoelectric performance in Ca substituted Sr3SnO
• Negative ionic states of tin in the oxide superconductor Sr${}_{3-x}$SnO revealed by Mössbauer spectroscopy
• Exploration of the spin-phonon coupling in the noncollinear antiferromagnetic antiperovskite Mn${}_3$NiN
• Evolution of Band Topology by Competing Band Overlap and Spin-Orbit Coupling: Twin Dirac Cones in Ba${}_3$SnO as a Prototype
• Computational search for Dirac and Weyl nodes in $f$-electon antiperovskites
• Majorana multipole response: General theory and application to wallpaper groups
• Magnetic Response of Majorana Kramers Pairs Protected by Z2 Invariants
• Magnetic response of Majorana Kramers pairs with an order-two symmetry
• Dirty two-band superconductivity with interband pairing order
• Normal-state properties of the antiperovskite oxide Sr${}_{3-x}$SnO revealed by ${}^{119}$Sn-NMR
• Antiperovskite superconductor LaPd${}_3$P with noncentrosymmetric cubic structure
• Nodal S-wave Superconductivity in Antiferromagnetic Semimetals
• Quasi-2D Fermi surface of superconducting line-nodal metal CaSb${}_2$
• Weyl nodes and magnetostructural instability in antiperovskite Mn${}_3$ZnC
• Anionic nickel and nitrogen effects in the chiral antiferromagnetic antiperovskite Mn${}_3$NiN
• Topological Nontrivial Phase in Hexagonal Antiperovskites A3BiB (A=Ba,Sr; B=P,N)
• Electric Multipoles of Double Majorana Kramers Pairs
• Crystal growth and characterization of the antiperovskite superconductor MgC1-xNi3-y
• Perspective: Molecular beam epitaxy of antiperovskite oxides
• Penetration depth and gap structure in the antiperovskite oxide superconductor Sr${}_{3-x}$SnO revealed by $\mu$SR
• Representation-protected topology of spin-singlet $s$-wave superconductors
• Realization of Epitaxial Thin Films of the Topological Crystalline Insulator Sr${}_3$SnO
• Majorana Spin Current Generation by Dynamic Strain
• Helical Topological Superconducting Pairing at Finite Excitation Energies
• Superconducting phase diagram of multi-layer square-planar nickelates
• Structural phase transitions and superconductivity induced in antiperovskite phosphide CaPd${}_3$P
• Possible topological phases in quantum anomalous Hall insulator/unconventional superconductor hybrid systems