TY - JOUR
T1 - Low temperature scanning tunneling spectroscopy studies of high J c NdBa2Cu3O7-δ single crystals
AU - Nishiyama, M.
AU - Kinoda, G.
AU - Shibata, S.
AU - Hasegawa, T.
AU - Koshizuka, N.
AU - Murakami, M.
N1 - Funding Information:
This work was supported by New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications.
PY - 2002
Y1 - 2002
N2 - We report low temperature scanning tunneling spectroscopy (STS) studies on NdBa2Cu3O7-δ (Nd123) single crystals. Two characteristic spectra with a nearly ohmic background spectrum and a V-shaped background are observed on the cleaved surfaces. The former spectum shows an inhomogeneous distribution of a superconducting energy gap (2Δ) for STS differential conductance map. The latter shows a homogeneous distribution. It is probable that those differences are attributed to a tunneling current from different surface layers. The temperature dependence of tunneling conductance spectrum with a V-shaped background reveals that the superconducting gap disappears around Tc, and no pseudogap behavior exists above T c.
AB - We report low temperature scanning tunneling spectroscopy (STS) studies on NdBa2Cu3O7-δ (Nd123) single crystals. Two characteristic spectra with a nearly ohmic background spectrum and a V-shaped background are observed on the cleaved surfaces. The former spectum shows an inhomogeneous distribution of a superconducting energy gap (2Δ) for STS differential conductance map. The latter shows a homogeneous distribution. It is probable that those differences are attributed to a tunneling current from different surface layers. The temperature dependence of tunneling conductance spectrum with a V-shaped background reveals that the superconducting gap disappears around Tc, and no pseudogap behavior exists above T c.
KW - NdBaCuO single crystals
KW - Scanning tunneling spectroscopy
KW - Superconducting energy gap
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M3 - Article
AN - SCOPUS:9744254515
SN - 1557-1939
VL - 15
SP - 351
EP - 354
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
IS - 5
ER -