|
|||||
|
|
Photoemission results of intermetallic superconductors: Nb3Al and MgB2 |
|
| Authors: | T YokoyaA Chainani T KissK Hirata Y TakanoK Togano H KitoH Ihara S Shin |
| Institution: | a Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan b Institute for Plasma Research, Bhat, Gandhinagar 382 044, India c National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan d National Institute of Advanced Industrial Science and Technology, 1-1-4 Umezono, Tsukuba 305-8568, Japan e The Institute of Physical and Chemical Research (RIKEN), Sayo-gun, Hyogo 679-5143, Japan |
| Abstract: | We study the superconducting electronic structures of Nb3Al and MgB2 using high-resolution spectroscopy. The obtained spectrum of Nb3Al measured below Tc shows clear opening of the superconducting gap with a sharp pile up in the density of states and a shift of the leading edge. In addition, the spectrum shows a peak-dip-hump line shape expected from the strong-coupling theory. On the other hand, for MgB2, the superconducting-state spectrum measured at 5.4 K shows a coherent peak with a shoulder structure, in sharp contrast to that expected from a single isotropic gap. The superconducting spectral shape of MgB2 can be explained in terms of a multicomponent gap. |
| Keywords: | A Intermetallic compounds D Electronic structure |
| 本文献已被 ScienceDirect 等数据库收录！ | |