TY - JOUR
T1 - STM/STS studies on the energy gap of Pb-substituted Bi2Sr 2CuO6+δ in magnetic fields
AU - Kudo, K.
AU - Nishizaki, T.
AU - Okamoto, D.
AU - Okumura, N.
AU - Kobayashi, N.
N1 - Funding Information:
This work was partly supported by a Grant-in-Aid for Scientific Research on Priority Areas (No. 451) from the MEXT, Japan. We thank Y. Murakami for EPMA at the Advanced Research Center of Metallic Glasses, IMR, Tohoku University.
PY - 2010/12
Y1 - 2010/12
N2 - The tunneling spectrum of high-Tc cuprates simultaneously exhibits kinks (or peaks) at low energy and peaks at high energy, suggesting the existence of two energy gaps. In order to clarify origins of these two gaps, we have performed the scanning tunneling microscopy/spectroscopy of the slightly overdoped Pb-substituted Bi2Sr2CuO6+δ (Pb-Bi2201) (Tc∼20K) in magnetic fields. In zero field, almost all tunneling spectra exhibit clear peaks. In many cases, two peaks are simultaneously found around 10 mV and above 20 mV in each tunneling spectrum. By the application of the magnetic field of 7 T, peaks around 10 mV are strongly suppressed, but ones above 20 mV are not changed. The result indicates that peaks around 10 mV and above 20 mV possibly correspond to the superconducting gap and the pseudogap, respectively.
AB - The tunneling spectrum of high-Tc cuprates simultaneously exhibits kinks (or peaks) at low energy and peaks at high energy, suggesting the existence of two energy gaps. In order to clarify origins of these two gaps, we have performed the scanning tunneling microscopy/spectroscopy of the slightly overdoped Pb-substituted Bi2Sr2CuO6+δ (Pb-Bi2201) (Tc∼20K) in magnetic fields. In zero field, almost all tunneling spectra exhibit clear peaks. In many cases, two peaks are simultaneously found around 10 mV and above 20 mV in each tunneling spectrum. By the application of the magnetic field of 7 T, peaks around 10 mV are strongly suppressed, but ones above 20 mV are not changed. The result indicates that peaks around 10 mV and above 20 mV possibly correspond to the superconducting gap and the pseudogap, respectively.
KW - Pb-substituted Bi2201
KW - Scanning tunneling microscopy/spectroscopy
KW - Two gaps
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U2 - 10.1016/j.physc.2009.10.047
DO - 10.1016/j.physc.2009.10.047
M3 - Article
AN - SCOPUS:78649756517
VL - 470
SP - S195-S196
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - SUPPL.1
ER -