TY - JOUR
T1 - Direct observation of superconducting gaps in MgB2 by angle-resolved photoemission spectroscopy
AU - Souma, S.
AU - Machida, Y.
AU - Sato, T.
AU - Takahashi, T.
AU - Matsui, H.
AU - Wang, S. C.
AU - Ding, H.
AU - Kaminski, A.
AU - Campuzano, J. C.
AU - Sasaki, S.
AU - Kadowaki, K.
N1 - Funding Information:
This work was supported by grants from the MEXT of Japan, JSPS and US NSF. S.S. thanks JSPS for financial support. The Synchrotron Radiation Center is supported by US NSF.
PY - 2004/8
Y1 - 2004/8
N2 - High-resolution angle-resolved photoemission spectroscopy has been carried out to clarify the anomalous superconductivity of MgB2. We observed three bands crossing the Fermi level, which are ascribed to B2p-σ, π and surface bands. We have succeeded for the first time in directly observing the superconducting gaps of these bands separately. We have found that the superconducting-gap sizes of σ and surface bands are 6.5 ± 0.5 and 6.0 ± 0.5 meV, respectively, while that of the π band is much smaller (1.5 ± 0.5 meV). The present experimental result unambiguously demonstrates the validity of the two-band superconductivity in MgB2.
AB - High-resolution angle-resolved photoemission spectroscopy has been carried out to clarify the anomalous superconductivity of MgB2. We observed three bands crossing the Fermi level, which are ascribed to B2p-σ, π and surface bands. We have succeeded for the first time in directly observing the superconducting gaps of these bands separately. We have found that the superconducting-gap sizes of σ and surface bands are 6.5 ± 0.5 and 6.0 ± 0.5 meV, respectively, while that of the π band is much smaller (1.5 ± 0.5 meV). The present experimental result unambiguously demonstrates the validity of the two-band superconductivity in MgB2.
KW - ARPES
KW - MgB
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U2 - 10.1016/j.physc.2004.02.054
DO - 10.1016/j.physc.2004.02.054
M3 - Conference article
AN - SCOPUS:4344705046
SN - 0921-4534
VL - 408-410
SP - 102
EP - 103
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-4
T2 - Proceedings of the International Conference on Materials
Y2 - 25 May 2003 through 30 May 2003
ER -