Superconducting Properties of the K${}_x$WO${}_3$ Tetragonal Tungsten Bronze and the Superconducting Phase Diagram of the Tungsten Bronze Family

Abstract

We report the superconducting properties of the K${}_x$WO${}_3$ tetragonal tungsten bronze. The highest superconducting transition temperature ($T_c=2.1$K) was obtained for K${}_{0.38}$WO${}_3$. $T_c$ decreases linearly with increasing K content. Using the measured values for the upper critical field $H_{c2}$, and the specific heat $C$, we estimate the orbital critical field $H_{c2}$(0), coherence length $\xi$(0), Debye temperature ${\Theta }_D$ and coupling constant ${\lambda }_{ep}$. The magnitude of the specific heat jump at $T_c$ suggests that the K${}_x$WO${}_3$ tetragonal tungsten bronze is a weakly-coupled superconductor. The superconducting phase diagram of the doped tungsten bronze family is presented.

7 Pages, 6 figures and 1 Table

References in corpus (3)

• Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials
• Superconductivity in WO2.6F0.4 synthesized by reaction of WO3 with Teflon
• Ab initio probing of the electronic band structure and Fermi surface of fluorine-doped WO3 as a novel low-TC superconductor

Cited by in corpus (11)

• Resonance-state-induced superconductivity at high Indium contents in In-doped SnTe
• Superconducting Properties of BaBi${}_3$
• Charge doping and large lattice expansion in oxygen-deficient heteroepitaxial WO3
• Characterization of the Heavy Metal Pyrochlore Lattice Superconductor CaIr2
• Group-9 Transition Metal Suboxides Adopting the Filled-Ti${}_2$Ni Structure: A Class of Superconductors Exhibiting Exceptionally High Upper Critical Fields
• Ir d-band Derived Superconductivity in the Lanthanum-Iridium System LaIr3
• Theoretical investigation of twin boundaries in WO${}_3$: Structure, properties and implications for superconductivity
• Transition Temperature of Superconductivity in Sodium Tungsten Bronze -Theoretical Study Based on First-principles Calculations-
• Organometallic-like localization of 4d-derived spins in an inorganic conducting niobium suboxide
• Epitaxial growth of hexagonal tungsten bronze CsxWO3 films in superconducting phase region exceeding bulk limit
• Introduction to High-Temperature Superconductivity for Solid State Chemists