5 papers
Possible pseudogap behavior of electron doped high-temperature superconductors
S. Kleefisch, B. Welter, M. Naito +3
We have measured the low-energy quasiparticle excitation spectrum of the electron doped high-temperature superconductors (HTS) Nd(1.85)Ce(0.15)CuO(4-y) and Pr(1.85)Ce(0.15)CuO(4-y)…
Anomalous Low Temperature Behavior of Superconducting Nd(1.85)Ce(0.15)CuO(4-y)
L. Alff, S. Meyer, S. Kleefisch +5
We have measured the temperature dependence of the in-plane London penetration depth lambda(T) and the maximum Josephson current Ic(T) using bicrystal grain boundary Josephson junc…
Andreev Bound States in High Temperature Superconductors
L. Alff, S. Kleefisch, U. Schoop +5
Andreev bound states (ABS) at the surface of superconductors are expected for any pair potential showing a sign change in different k-directions with their spectral weight dependin…
Observation of Bound Surface States in Grain Boundary Junctions of High Temperature Superconductors
L. Alff, A. Beck, R. Gross +6
We have performed a detailed study of the tunneling spectra of bicrystal grain boundary junctions (GBJs) fabricated from the HTS YBCO, BSCCO, LSCO, and NCCO. In all experiments the…
Superconducting NdCeCuO Bicrystal Grain Boundary Josephson Junctions
S. Kleefisch, L. Alff, U. Schoop +4
We have studied the electric transport properties of symmetrical [001] tilt NdCeCuO bicrystal grain boundary Josephson junctions (GBJs) fabricated on SrTiO bicrystal substrates wit…