Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2

F. Manzano; A. Carrington; N. E. Hussey; S. Lee; A. Yamamoto

doi:10.1103/PhysRevLett.88.047002

Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2

Superconductivity 2009-11-07 v2

Authors: F. Manzano , A. Carrington , N. E. Hussey , S. Lee , A. Yamamoto

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

The temperature dependence of the London penetration depth,lambda(T), was measured in both single crystal and polycrystalline MgB_2 samples by a high-resolution, radio frequency technique. A clear exponential temperature dependence of lambda(T) was observed at low temperature, indicating s-wave pairing. A BCS fit to the lowest temperature data gives an in-plane energy gap Delta of 2.6\pm0.2 meV (2\Delta/T_c=1.5\pm0.1), which is significantly smaller than the standard BCS weak coupling value of 3.5. We find that the data are best described by a two-gap model.

Keywords

penetration depth temperature dependence single crystal MgB_2 s-wave pairing two-gap model

Cite

@article{arxiv.cond-mat/0110109,
  title  = {Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2},
  author = {F. Manzano and A. Carrington and N. E. Hussey and S. Lee and A. Yamamoto},
  journal= {arXiv preprint arXiv:cond-mat/0110109},
  year   = {2009}
}

Comments

Minor corrections added, as per published article

Exponential Temperature Dependence of Penetration Depth in Single Crystal MgB_2

Abstract

Keywords

Cite

Comments

Related papers