TY - JOUR
T1 - Tunneling spectroscopy of high-Tc superconductors
AU - Alff, L.
AU - Marx, A.
AU - Gross, R.
AU - Beck, A.
AU - Takashima, H.
AU - Kashiwaya, S.
AU - Koyanagi, M.
AU - Tanaka, Y.
PY - 1999
Y1 - 1999
N2 - We have performed tunneling spectroscopy experiments on different kinds of high-temperature superconductors (HTS) and different types of junctions. Firstly, spectra were taken on surfaces of YBa2Cu3O7-δ (YBCO) thin films and Nd1.85Ce0.15CuO4-γ (NCCO) single crystals by low-temperature scanning tunneling microscopy/spectroscopy (LTSTM/S) in a superconductor-insulator-normal metal (SIN) configuration. Second, the tunneling spectra of grain-boundary junctions (GBJs) fabricated on bicrystal substrates were measured for the materials YBCO, La1.85Sr0.15CuO4-δ (LSCO), Bi2Sr2Ca-Cu2O8 + δ (BSCCO) and NCCO in a SIS configuration. The characteristics of the spectra in both systems could be related to the symmetry of the order parameter in the superconducting electrode(s). In particular, a zero bias conductance peak (ZBCP) was observed only in systems with a d-wave symmetry, but was completely absent in the s-wave system NCCO.
AB - We have performed tunneling spectroscopy experiments on different kinds of high-temperature superconductors (HTS) and different types of junctions. Firstly, spectra were taken on surfaces of YBa2Cu3O7-δ (YBCO) thin films and Nd1.85Ce0.15CuO4-γ (NCCO) single crystals by low-temperature scanning tunneling microscopy/spectroscopy (LTSTM/S) in a superconductor-insulator-normal metal (SIN) configuration. Second, the tunneling spectra of grain-boundary junctions (GBJs) fabricated on bicrystal substrates were measured for the materials YBCO, La1.85Sr0.15CuO4-δ (LSCO), Bi2Sr2Ca-Cu2O8 + δ (BSCCO) and NCCO in a SIS configuration. The characteristics of the spectra in both systems could be related to the symmetry of the order parameter in the superconducting electrode(s). In particular, a zero bias conductance peak (ZBCP) was observed only in systems with a d-wave symmetry, but was completely absent in the s-wave system NCCO.
UR - http://www.scopus.com/inward/record.url?scp=0032173971&partnerID=8YFLogxK
U2 - 10.1016/S0964-1807(99)00042-3
DO - 10.1016/S0964-1807(99)00042-3
M3 - Article
AN - SCOPUS:0032173971
SN - 0964-1807
VL - 6
SP - 783
EP - 787
JO - Applied Superconductivity
JF - Applied Superconductivity
IS - 10-12
ER -