Dirty Superconductivity in the Electron-Doped CupratePr2−xCexCuO4−δ: Tunneling Study

Electron tunneling and superconductivity.

Superconductivity versus Tunneling in a Doped Antiferromagnetic Ladder

The low-energy charge excitations of a doped antiferromagnetic ladder are modeled by a system of interacting spinless fermions that live on the same ladder. A relatively large spin gap is assumed to “freeze out” all spin fluctuations. We find that the formation of rung hole pairs coincides with the opening of a single-particle gap for charge excitations along chains and with the absence of cohe...

Evolution of superconductivity in electron-doped cuprates: Magneto-Raman spectroscopy

M. M. Qazilbash,1,2,* A. Koitzsch,1,† B. S. Dennis,1 A. Gozar,1,‡ Hamza Balci,2 C. A. Kendziora,3 R. L. Greene,2 and G. Blumberg1,§ 1Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA 2Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742, USA 3United States Naval Research Laboratory, Code 6365, Washington D.C....

Unconventional superconductivity in electron-doped layered Li0.48(THF)yHfNCL.

We report magnetic susceptibility measurements on a layered superconductor Li0.48(THF)0.3HfNCl having Tc approximately 26 K. The present study revealed that (a) the Fermi level density of states is small, N*(EF) approximately 0.25 states/(eV spin f.u.), (b) mass enhancement is negligible, gamma; approximately 1, (c) electron-phonon coupling is weak, lambda(ep)<<1, (d) exchange enhancement is ne...

Superconductivity in MgB2: clean or dirty?

A large number of experimental facts and theoretical arguments favor a two-gap model for superconductivity in MgB2. However, this model predicts strong suppression of the critical temperature by interband impurity scattering and, presumably, a strong correlation between the critical temperature and the residual resistivity. No such correlation has been observed. We argue that this fact can be u...