Transport properties of Ag5Pb2O6: A three-dimensional electron-gas-like system with low carrier density

Abstract

We report normal-state transport properties of the single-crystalline samples of the silver-lead oxide superconductor Ag 5 Pb 2 O 6 , including the electrical resistivity, magnetoresistance, and Hall coefficient. From the Hall coefficient measurement, we confirmed that the carrier density of this oxide is as low as 5 × 10 21 cm −3 , one order of magnitude smaller than those for ordinary alkali metals and noble metals. The magnetoresistance behavior is well characterized by the axial symmetry of the Fermi surface and by a single relaxation time. The T 2 term of the resistivity is scaled with the specific heat coefficient, based on the recent theory for the electron-electron scattering. The present results provide evidence that Ag 5 Pb 2 O 6 is a low-carrier-density three-dimensional electron-gas-like system with enhanced electron-electron scatterings.

Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides

“…[30][31][32] Another superconductor that exhibits such quadratic dependence of its resistivity near room temperature is Ag 5 Pb 2 O 6 , which is a three-dimensional electron-gas system. [33] Yonezawa and Maeno ascribe the T 2 behaviour to enhanced electron-electron scattering that arises in superconductors with low electron carrier densities with respect to elements such as alkali and noble metals. [33] Therefore, it is possible that both the lower T c and T 2 -behaviour for the sample presented in Fig.…”

“…[33] Yonezawa and Maeno ascribe the T 2 behaviour to enhanced electron-electron scattering that arises in superconductors with low electron carrier densities with respect to elements such as alkali and noble metals. [33] Therefore, it is possible that both the lower T c and T 2 -behaviour for the sample presented in Fig. 2a and Fig.…”

When is the Kadowaki-Woods ratio universal?

“…electron density and dimensionality) [13,16]. Furthermore, it has been shown [13] that the modified KWR A/γ 2 f , where f is a material specific function of the non-interacting band structure (defined below), takes the same predicted value, 81/4π k 2 B e 2 , in a large range of transition metals, charge transfer salts, heavy fermion compounds, and elemental metals, a result which has since been verified in many other materials [18][19][20][21][22].…”

“…electron density and dimensionality) [13,16]. Furthermore, it has been shown [13] that the modified KWR A/γ 2 f , where f is a material specific function of the non-interacting band structure (defined below), takes the same predicted value, 81/4π k 2 B e 2 , in a large range of transition metals, charge transfer salts, heavy fermion compounds, and elemental metals, a result which has since been verified in many other materials [18][19][20][21][22].Deviations from this universal predicted value of the KWR could provide an indication of non-Fermi liquid behavior. Most previous calculations of the (modified) KWR [8,10,13] have focused on simple, single-band models with toy dispersion relations, e.g.…”