Electronic Density of State and Debye Temperature for Low (Nb3Sn, Nb3Al) and High (MgB2, YBa2Cu3O7) Temperature Superconductors

SUPERCONDUCTING TRANSITION TEMPERATURE AND ELECTRONIC STRUCTURE IN THE PSEUDOBINARIES Nb3Al-Nb3Sn and Nb3Sn-Nb3Sb

The system Nb~Al Sn, exhibits complete solid solubility, a positive Seebeck voltage that increases monatomically from 1.8 to over 12 |dV/°K, and a superconducting transition temperature T that has a broad minimum of T « 15.3 °K at about y = 0.5. The c c pseudobinary Nb-Sn, Sb , on the other hand, contains two phases, ■3 x"X X each with the A15 structure, in the interval 0.3 < x < 0.8. Whereas t...

Comparison of small-field behavior in MgB2, Low- and high-temperature superconductors

Hysteresis and noise from electronic nematicity in high-temperature superconductors.

An electron nematic is a translationally invariant state which spontaneously breaks the discrete rotational symmetry of a host crystal. In a clean square lattice, the electron nematic has two preferred orientations, while dopant disorder favors one or the other orientations locally. In this way, the electron nematic in a host crystal maps to the random field Ising model. Since the electron nema...

Electronic phase diagram of high-temperature copper oxide superconductors.

In order to understand the origin of high-temperature superconductivity in copper oxides, we must understand the normal state from which it emerges. Here, we examine the evolution of the normal state electronic excitations with temperature and carrier concentration in Bi(2)Sr(2)CaCu(2)O(8+δ) using angle-resolved photoemission. In contrast to conventional superconductors, where there is a single...

The Electronic Nature of High Temperature Cuprate Superconductors

We review the field of high temperature cuprate superconductors, with an emphasis on the nature of their electronic properties. After a general overview of experiment and theory, we concentrate on recent results obtained by angle resolved photoemission, inelastic neutron scattering, and optical conductivity, along with various proposed explanations for these results. We conclude by reviewing ef...