From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba, K)Fe2As2
| Title | From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba, K)Fe2As2 |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Reid JP, Juneau-Fecteau A, Gordon RT, de Cotret SR, Doiron-Leyraud N, Luo XG, Shakeripour H, Chang J, Tanatar MA, Kim H, Prozorov R, Saito T, Fukazawa H, Kohori Y, Kihou K, Lee CH, Iyo A, Eisaki H, Shen B, Wen HH, Taillefer L |
| Journal Title | Superconductor Science & Technology |
| Volume | 25 |
| Pages | 084013 |
| Date Published | 08 |
| Type of Article | Article |
| ISBN Number | 0953-2048 |
| Accession Number | WOS:000306505100014 |
| Keywords | quasi-particle transport, thermal-conductivity, vortex state, yba2cu3o6.9 |
| Abstract | The nature of the pairing state in iron-based superconductors is the subject of much debate. Here we argue that in one material, the stoichiometric iron pnictide KFe2As2, there is overwhelming evidence for a d-wave pairing state, characterized by symmetry-imposed vertical line nodes in the superconducting gap. This evidence is reviewed, with a focus on thermal conductivity and the strong impact of impurity scattering on the critical temperature T-c. We then compare KFe2As2 to Ba0.6K0.4Fe2As2, obtained by Ba substitution, where the pairing symmetry is s-wave and the T-c is ten times higher. The transition from d-wave to s-wave within the same crystal structure provides a rare opportunity to investigate the connection between band structure and the pairing mechanism. We also compare KFe2As2 with the nodal iron-based superconductor LaFePO, for which the pairing symmetry is probably not d-wave, but more likely s-wave with accidental line nodes. |
| URL | <Go to ISI>://WOS:000306505100014 |
| DOI | 10.1088/0953-2048/25/8/084013 |
| Alternate Journal | Supercond. Sci. Technol. |
