2009年5月
Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
PHYSICAL REVIEW LETTERS
- 巻
- 102
- 号
- 20
- 開始ページ
- 207001-1
- 終了ページ
- 207001-4
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.102.207001
- 出版者・発行元
- AMER PHYSICAL SOC
We report high-sensitivity microwave measurements of the in-plane penetration depth lambda(ab) and quasiparticle scattering rate 1/tau in several single crystals of the hole-doped Fe-based superconductor Ba1-xKxFe2As2 (x approximate to 0.55). While a power-law temperature dependence of lambda(ab) with a power similar to 2 is found in crystals with large 1/tau, we observe an exponential temperature dependence of the superfluid density consistent with the existence of fully opened two gaps in the cleanest crystal we studied. The difference may be a consequence of different levels of disorder inherent in the crystals. We also find a linear relation between the low-temperature scattering rate and the density of quasiparticles, which shows a clear contrast to the case of d-wave cuprate superconductors with nodes in the gap. These results demonstrate intrinsically nodeless order parameters in the Fe arsenides.
- リンク情報
-
- DOI
- https://doi.org/10.1103/PhysRevLett.102.207001
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902266120561725
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000266309000054&DestApp=WOS_CPL
- ID情報
-
- DOI : 10.1103/PhysRevLett.102.207001
- ISSN : 0031-9007
- J-Global ID : 200902266120561725
- Web of Science ID : WOS:000266309000054