TY - JOUR
T1 - Superconducting transitions studied by ultrahigh-resolution photoemission
AU - Yokoya, T.
AU - Kiss, T.
AU - Chainani, A.
AU - Shin, S.
N1 - Funding Information:
We would like to thank Professors M. Nohara and H. Takagi for providing single crystals of borocarbides. We would like to thank Professor T. Oguch for calculating the Fermi surface of Y(Ni 0.8 Pt 0.2 ) 2 B 2 C. We would also like to thank T. Watanabe for his help in performing photoemission spectroscopy on Ni borocarbides. This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Culture and Sports of Japan.
PY - 2002
Y1 - 2002
N2 - Superconducting transitions of elemental metals and Ni borocarbides are studied using ultrahigh-resolution and low-temperature photoemission spectroscopy. Photoemission spectra of elemental metals (Nb and Pb) show the appearance of a sharp peak just below the Fermi level and a shift of the leading edge, indicating clear opening of the superconducting gap. Furthermore, Pb spectrum shows a dip and hump structure beyond the peak, characteristic of the strong-coupling superconductivity. On the other hand, comparative study of Y(Ni1-xPtx)2B2C (x=0.0 and 0.2) shows a difference in the slope of the leading edge, which can be explained in terms of a highly anisotropic s-wave gap in YNi2B2C, consistent to magnetic field dependent specific heat measurements. These observations demonstrate that photoemission spectroscopy is a useful and reliable technique to study electronic structures and phase transitions at very small energy scales.
AB - Superconducting transitions of elemental metals and Ni borocarbides are studied using ultrahigh-resolution and low-temperature photoemission spectroscopy. Photoemission spectra of elemental metals (Nb and Pb) show the appearance of a sharp peak just below the Fermi level and a shift of the leading edge, indicating clear opening of the superconducting gap. Furthermore, Pb spectrum shows a dip and hump structure beyond the peak, characteristic of the strong-coupling superconductivity. On the other hand, comparative study of Y(Ni1-xPtx)2B2C (x=0.0 and 0.2) shows a difference in the slope of the leading edge, which can be explained in terms of a highly anisotropic s-wave gap in YNi2B2C, consistent to magnetic field dependent specific heat measurements. These observations demonstrate that photoemission spectroscopy is a useful and reliable technique to study electronic structures and phase transitions at very small energy scales.
KW - Anisotropic s-wave gap
KW - Strong-coupling super-conductivity
KW - Superconducting transition
KW - Ultrahigh-resolution and low-temperature photoemission spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=0036643984&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036643984&partnerID=8YFLogxK
U2 - 10.1016/S0368-2048(02)00047-6
DO - 10.1016/S0368-2048(02)00047-6
M3 - Article
AN - SCOPUS:0036643984
VL - 124
SP - 99
EP - 105
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
SN - 0368-2048
IS - 2-3
M1 - 4373
ER -