TY - JOUR
T1 - The Fermi surface and sheet-dependent superconducting gap of MgB 2
AU - Tsuda, S.
AU - Yokoya, T.
AU - Shin, S.
AU - Takano, Y.
AU - Kito, H.
AU - Matsushita, A.
AU - Yin, F.
AU - Itoh, J.
AU - Harima, H.
N1 - Funding Information:
This work was supported by a Grant-in-aid from the Ministry of Education, Science, and Culture of Japan. S.T. thanks the Japan Society for the Promotion of Science for financial support.
PY - 2004/10
Y1 - 2004/10
N2 - The Fermi surface and superconducting gap of MgB2 have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the σ band and the π band are clearly observed without contaminated by the "surface-derived" band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the σ band and the π band, respectively, both of which close at the bulk transition temperature (Tc). This result provides an experimental evidence for the two-band superconductivity on MgB2 and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature (Tc) of MgB2.
AB - The Fermi surface and superconducting gap of MgB2 have been studied by angle-resolved photoemission spectroscopy. Two Fermi surfaces composed of the σ band and the π band are clearly observed without contaminated by the "surface-derived" band. The high-resolution photoemission spectra show that superconducting gaps with values of 5.5 and 2.2 meV open on the σ band and the π band, respectively, both of which close at the bulk transition temperature (Tc). This result provides an experimental evidence for the two-band superconductivity on MgB2 and, moreover, validates the role of momentum-dependent electron-phonon coupling as the origin of multiple-gap superconductivity as well as the high transition temperature (Tc) of MgB2.
KW - MgB
KW - Photoemission
KW - Superconducting gap
UR - http://www.scopus.com/inward/record.url?scp=4644240614&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4644240614&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2004.01.037
DO - 10.1016/j.physc.2004.01.037
M3 - Article
AN - SCOPUS:4644240614
VL - 412-414
SP - 36
EP - 40
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - SPEC. ISS.
ER -