Weak Coupling BCS-like Superconductivity in the Pnictide Oxide Ba${}_{1-x}$Na${}_x$Ti${}_2$Sb${}_2$O (x=0 and 0.15)

Abstract

We report the results of low-temperature heat capacity measurements of the pnictide oxide superconductor BaTi${}_2$Sb${}_2$O doped with sodium. The temperature and field dependent heat capacity data are well described by a single-gap BCS theory. The estimated values for the normal state Sommerfeld constant, the heat capacity jump at $T_c$, and the electron-phonon coupling constant are in favor of a conventional weak coupling superconductivity mediated by electron-phonon interaction. The results are discussed with regard to and compared with recent first principle calculations.

5 pages, 6 figures, to be published in Physical Review B

References in corpus (7)

• High-temperature superconductivity in iron-based materials
• Ba1-xNaxTi2Sb2O (0.0 <= x <= 0.33): A Layered Titanium-based Pnictide Oxide Superconductor
• Electronic structure, disconnected Fermi surfaces and antiferromagnetism in the layered pnictide superconductor Na${}_x$Ba${}_{1-x}$Ti${}_2$Sb${}_2$O
• S wave superconductivity in newly discovered superconductor BaTi${}_2$Sb${}_2$O revealed by ${}^{121/123}$Sb-NMR/Nuclear Quadrupole Resonance measurements
• Superconductivity, charge- or spin-density wave, and metal-nonmetal transition in BaTi${}_2$(Sb${}_{1-x}$Bi${}_x$)${}_2$O
• Electron-phonon superconductivity and charge density wave instability in the layered titanium-based pnictide BaTi${}_2$Sb${}_2$O
• Superconducting properties of nanocrystalline MgB${}_2$

Cited by in corpus (10)

• Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
• Superconductivity in Ba1-xKxTi2Sb2O (0 < x < 1) controlled by charge doping
• Intra-unit-cell nematic charge order in the titanium-oxypnictide family of superconductors
• Superconductivity in rubidium substituted Ba1-xRbxTi2Sb2O
• Theoretical Prediction of the Nematic Orbital-Ordered State in Ti-Oxypnictide Superconductor BaTi2(As,Sb)2O
• Superconductivity in titanium-based pnictide oxide compounds
• High pressure study of the normal and superconducting states of the layered pnictide oxide Ba${}_{1-x}$Na${}_x$Ti${}_2$Sb${}_2$O with x = 0, 0.10, and 0.15
• Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O
• Exotic phase transition and superconductivity in layered titanium-oxypnictides implied by a computational phonon analysis
• Theory for doping trends in titanium oxypnictide superconductors