Evidence for Strong-coupling S-wave Superconductivity in MgB2 :11B NMR Study

H. Kotegawa; K. Ishida; Y. Kitaoka; T. Muranaka; J. Akimitsu

doi:10.1103/PhysRevLett.87.127001

Evidence for Strong-coupling S-wave Superconductivity in MgB2 :11B NMR Study

Superconductivity 2009-11-07 v1

Authors: H. Kotegawa , K. Ishida , Y. Kitaoka , T. Muranaka , J. Akimitsu

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We have investigated a gap structure in a newly-discovered superconductor, MgB2 through the measurement of 11B 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 2\Delta /k_BT_c \sim 5 which suggests to be in a strong-coupling regime.

Keywords

strong-coupling S-wave superconductivity MgB2 11B NMR coherence peak

Cite

@article{arxiv.cond-mat/0102334,
  title  = {Evidence for Strong-coupling S-wave Superconductivity in MgB2 :11B NMR Study},
  author = {H. Kotegawa and K. Ishida and Y. Kitaoka and T. Muranaka and J. Akimitsu},
  journal= {arXiv preprint arXiv:cond-mat/0102334},
  year   = {2009}
}

Comments

2 pages with 1 figure

Related papers

View all related →