Evidence for strong-coupling s-wave superconductivity in MgB2: (11)B NMR Study |
| |
| Authors: | Kotegawa H Ishida K Kitaoka Y Muranaka T Akimitsu J |
| |
| Institution: | Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. |
| |
| Abstract: | We have investigated a gap structure in a newly discovered superconductor, MgB2, through measurement of the (11)B nuclear spin-lattice relaxation rate, (11)(1/T(1)). (11)(1/T(1)) is proportional to the temperature (T) in the normal state, and decreases exponentially in the superconducting (SC) state, revealing a tiny coherence peak just below T(c). The T dependence of 1/T(1) in the SC state can be accounted for by an s-wave SC model with a large gap size of 2Delta/k(B)T(c) approximately 5 which suggests it is in a strong-coupling regime. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
